Stay tuned for match analysis and reaction.
What a difference a week makes, eh? Tevez is the hat-trick hero, but his compatriot Aguero was equally as good. Tevez claims the match ball and Man City surely now have Man Utd looking over their shoulders.
Full-time at Carrow Road.
90+4 It's six for Man City with Johnson finishing off a superb move. They haven't stopped attacking, they surely have goal difference in mind.
90+3 GOAL JOHNSON!!
Aguero is denied a hat-trick of his own, going ever so close as he now rattles the woodwork. The visitors are strolling to the whistle.
Aguero tees up Johnson, who shoots from the edge of the penalty area with an outside-of-the-boot effort, which clips the top of the bar.
The travelling support are jubilant and in full voice, singing their team home.
Credit to Paul Lambert mind, he really went for it with his changes and it almost paid off, only to come up against some exceptional football.
Man City are stroking about with ease now, with the game having lost its competitive edge after the second-half blitz from Roberto Mancini's men.
Aguero looks keen to complete his hat-trick too, but is dispossessed at the last.
Norwich are still putting a shift in, they haven't been poor today, by any means, the visitors have just been ruthless.
...That shouldn't be too much of a surprise actually, as the visitors have been sensational today.
To the home support's credit, there are still plenty of bums on seats inside Carrow Road.
Man City are in cruise control now, Norwich look deflated.
81 Richards replaces Tevez who receives a round of applause for his efforts from both sets of fans.
It's a hat-trick! Tevez has gone from zero to hero as he capitalises on a tame Ryan Bennett backpass before rounding Ruddy and slotting into an empty net.
...Take nothing away from the visitors, though, they're back to their best and have made this title race interesting again.
Could the title come down to goal difference? This might only fuel United's desire to beat Villa tomorrow, and beat them well.
There were 90 seconds in between the two goals, incidentally.
76 Silva makes way for Johnson in another change for Man City.
It's almost as though these two are trying to out-do each other. Aguero cuts inside onto his right and bends a delicious effort beyond Ruddy and into the top corner. Nothing the keeper could do about that, sublime stuff.
75 GOAL AGUERO!!
Silva slips in Yaya Toure, whose shot is spilled by Ruddy and it falls kindly for Tevez who nods the ball over the stranded keeper on the rebound. Man City's two-goal cushion is restored.
73 GOAL TEVEZ!!
It's a tight call against Tevez as the flag is raised when he's put through on goal, but it looks to be the correct decision.
Ruddy claims the delivery and releases the ball. Norwich are still very much in this.
Zabaleta forces Ruddy to tip over from a powerful drive - it's another Man City corner.
69 And that's Wilbraham's last act as he is replaced by Steve Morison.
Hoolahan has been fantastic since his introduction, but Wilbraham's effort from the Irishman's lay-off is blocked by Barry.
Aguero comes back into play after brief treatment on the touchline.
Aguero is down clutching his ankle. He appears to be okay, but it's not a pretty sight for Man City fans.
Norwich's full-backs are getting much more involved this half and as a result they're a much greater aerial threat than they were in the first.
Wilbraham does well to win a throw-in high up in Man City's half, with the hosts retaining possession from it.
63 Yaya Toure comes on for Nasri for the visitors.
Hoolahan earns a free-kick at the expense of Barry, and the Irishman takes it quickly after spotting Hart off the line, finding the side netting with a cheeky effort.
Tevez is throwing his weight around as Norwich continue their threat. The Argentine needs to be careful here, he's on a yellow card remember.
Zabaleta nips in at the back post unmarked, but his control lets him down and by the time he gets his shot away Ruddy has closed down his space and makes the save.
59 R Bennett goes into the book for halting Man City a counter-attack with a cynical foul.
Nasri's shot at goal is blocked following a short corner and Norwich retrieve the ball, still full of renewed confidence.
Aguero forces Ruddy into a firm stop at his near post. The keeper has his angles spot on but the visitors will attack again from the corner.
Howson does ever so well to force Aguero inside, where the defender dispossesses him and clears for the hosts.
Surman glances a header over the bar as Norwich's pressure continues.
This is a real test for Man City as E Bennett whips in a cross from Holt, who sees his effort on goal blocked. Hoolahan and Surman have made an immediate impact.
As is always the case when it's 2-0 at the break, the next goal is so crucial. Norwich have scored it early in the second-half and suddenly this game has a fresh edge.
Joe Hart us at fault as his tame punch lands kindly for substitute Surman, who remains calm, controls and calmly strokes it into the net with Hart stranded. Game on!
51 GOAL SURMAN!!
Holt drags a half-volley wide of the near post. Hart had it covered, but Norwich will be encouraged by the start they've made to this half.
Surman's long ball forward is cleared by the visiting defence, but their subsequent counter-attack breaks down.
Norwich have started the second half the brighter and remain in possession.
Holt finds himself with possession within shooting range, but Silva nicks the ball from under his foot at the last.
Man City restart the game hoping to preserve this lead and close the gap, at least provisionally, at the top of the Premier League.
Hoolahan and Surman come on for Norwich in place of Johnson and Pilkington.
Looks like Norwich have made a couple of changes at the break...
Norwich City fan @GardenersMrs is tracking from Florida having given away tickets for today's game in favour of a holiday. She's hoping for a second-half turnaround.
Paul Seawright in Belfast adds: "Looks like Man U peaked too soon and City are over their dip. April 30th won't be 6-1 but will be the decider."
Mike Hughes in Germany states: "Terrible news with Aguero & Tevez getting on the scoresheet - my main Fantasy League rival put both of them in his team! However, even as a Man United fan, I don't mind seeing this go to the wire. City deserve to be where they are."
@jt1998_13 says: "This is only a small glimmer of hope for city cos if villa can only draw to stoke at home I can't wait to see them play utd away."
@Mr_Darbyshire says: "I think Norwich will have a second-half surprise for City. Before City fans get excited, remember you have Newcastle away after Utd"
So, it's half-time at Carrow Road. Norwich have by no means been poor, but find themselves two-goals down thanks to some unplayable football from Man City. Compatriots Tevez and Aguero have the goals, with the former being the star player so far having assisted the second.
Half-time at Carrow Road.
E Bennett's cross is headed clear by Kompany and that should be that for the half.
We're into one of two added minutes at the end of the first half, with the visitors in possession.
A couple of sloppy passes from Kompany and Pilkington respectively sees both sides surrender possession.
Silva draws a foul from R Bennett and the visitors opt to retain possession from the free-kick rather than attack.
43 Nasri goes into the book for an earlier foul on Elliot Bennett.
Clichy shoots wildly from range - it looks as though Man City are happy enough to get to the break at 2-0.
We're coming up to half-time folks, get your thoughts sent to email@example.com or Tweet me @caseyja
Clichy stands firm against Wilbraham on the flank and comes away with possession, good defending that.
Matt James says: "There is too much panic from Man U fans. Even if City win today and Man U lose tomorrow, City are still 2 points behind."
After a good spell for Norwich, Man City are back on the ball and are happy to stroke it about to regain their composure.
Wilbraham shoots from range and hits the target, but it lacks the power to trouble Hart.
Norwich are making their opponents graft at the back now, and have a chance from a throw-in deep in Man City's half.
Martin whips in a low cross for Holt, who volleys on the turn and forces Hart into a neat save. That's one of Norwich's best moves today.
He's ok - the ball is back in play and Norwich have possession.
A tough tackle from Wilbraham floors Zabaleta. The Norwich man tells his opponent to get up, or so it would appear, but the Argentine is having treatment.
@Vinaykola says: "Tevez's return is working out for City. Mancini may have egg on his face for the U-turn, but I doubt he'll be regretting it now."
With almost half an hour gone, the visitors are in control and don't look like letting up.
Man City fans are buoyant now, and they've every right - their team are playing the sort of football we got so used to seeing earlier in the season.
Just as Norwich looks to be recovering, they're undone by a simply unstoppable drive from Aguero, who lashes a half-volley past Ruddy following an inviting tee-up from Tevez. Magnificent.
Norwich have settled a bit now and are stringing together a couple of nice passes.
Tevez is thirsty for more, and shoots from 30 yards this time, but gets too much underneath it as it sails high and wide.
Silva looks for the clever run of Zabaleta but the full-back can't control the pass and Ruddy collects the loose ball.
Aguero loses his balance and runs into traffic after initially taking up a good position. He somehow manages to earn a corner though as Man City's pressure continues.
Hart miscues a clearance but he gets away with it as Barry mops up the danger.
@Lilmckibbin says: "think title race is over united will win it but I think Norwich will win 2-1 come on Norwich"
Tevez is brimming with confidence now and he almost sneaks a second, but is forced to settle for a corner. Man City are in control now.
19 It's a fantastic strike from the Argentine, who collects from Silva with only one intention - to shoot on sight and how he does, drilling past Ruddy from a tight angle. The keeper, is beaten by sheer power and perhaps a slight nick on the way.
18 GOAL TEVEZ!!!
Aguero is flagged offside, he's been quiet so far by his standards.
"The race is definitely back on, united have everton and sunderland who could cause upsets with the form they're in, and city will win the derby no doubt," says Joe Hefferan.
@Henrypotter6 says: "dont belive that wilbraham should be playing and also drury both changed to jackson and naughton need some much needed pace to win"
Norwich are now piling on the pressure, with Holt having a header heroically cleared off the line by Lescott.
E Bennett crosses for R Bennett, whose shot takes a deflection for a Norwich corner.
Zabaleta's cross is closed down and Norwich look to counter...the move breaks down but they do look a threat on the break.
Elliot Bennett shoots from just inside the penalty area but it's straight down Hart's throat.
It's a debatable one, but Tevez did himself no favours with his tumble.
9 Tevez goes down rather easily, there is contact but the Argentine's theatrics earn him a yellow card.
Time for some more views - Adam Swayne believes Grant Holt will score a late winner here today with United going on to win the league. Gunner @cmedakovic wants a Man City win, despite having a soft spot for Norwich.
Norwich are giving as good as they're getting, immediately storming up the other end and earning a corner, which is punched away by Hart.
Aguero shoots wildly from range. Silly effort, really, as Man City should be making more of this early pressure.
Silva tests Ruddy from close range with a powerful drive from inside the area, but Norwich force Man City out of the penalty area in the immediate aftermath.
It's a frantic opening here, we could've had a goal at either end already.
Norwich clear off the line from a Man City corner and the hosts conjure up a fantastic counter, ending with Pilkington flashing a decent effort across the face of goal and wide.
Man City fans are in full voice, drowning out the home crowd.
Silva chipps a delightful through ball through for Nasri, the flag stays down but the Frenchman can't get it under control.
Norwich have now opened proceedings at Carrow Road, keep the thoughts rolling in folks.
Neutral Dave Birch has e-mailed in: "I'm a villa fan and hoping we can do city a big favour tomorrow by getting something at utd, I really hope city win today, they have nothing to lose and should be going for it, they have the players so no excuses."
Aguero and Silva were in devastating form against West Brom in midweek, and you can back them both to get on the score-sheet today at 5/1 with Sky Bet.
Kenya-based @missemadranya has chipped in with a graceful message: "As a proud Man Utd fan, I really hope they win the game. That is the only way Man Utd can play at their best tomorrow against Aston Villa. If the win, then the race is definitely going to the wire, I wanna see the excitement all the way 2 the end."
Norwich fans, we want to hear from you too. Can your side build on that superb win at Tottenham with another top-four scalp today? Get in touch.
@Samisnotataxi says: "I think that, as good as City are, United will just about hold on, even with their blip in midweek. SAF is a good manager."
Send me your views by e-mailing firstname.lastname@example.org or Tweet me @caseyja here.
What do City fans make of their chances now? Is it your team's turn to lump pressure on the league leaders and can United handle it? Or is it just a glimmer of hope in race practically won already?
So, with plenty of eyes on the FA Cup semi-final at Wembley, there's still the small matter of the Premier League title race, somewhat brought back to life by events in midweek.
The referee for today's game is Mr Chris Foy of Merseyside.
Norwich: Ruddy, Martin, Ward, Ryan Bennett, Drury, Elliott Bennett, Howson, Johnson, Pilkington, Holt, Wilbraham. Subs: Steer, Morison, Jackson, Surman, Hoolahan, Fox, Naughton.
Man City: Hart, Zabaleta, Kompany, Lescott, Clichy, De Jong, Barry, Nasri, Tevez, Aguero, Silva. Subs: Pantilimon, Richards, Milner, Dzeko, Johnson, Kolarov, Toure.