Arsenal were the big losers in Thursday's Champions League draw, according to Sky Bet - but Chelsea saw their odds cut.
The Gunners were pushed out to an industry-best 40/1 (from 25/1) after being placed in the same group as Marseille, last year's runners-up Borussia Dortmund and big-spending Napoli, who had been the dangerous floaters in the fourth pot of seeds.
Chelsea, on the other hand, got off lightly with matches against Schalke, FC Basel and Steaua Bucharest now on the agenda.
They were duly cut from 11/1 to 9/1 making them the most likely English winners at this stage. They are fourth favourites overall.
United were put in Group A alongside Shakhtar Donetsk, Bayer Leverkusen and Real Sociedad. They were moved in from 12/1 to 11/1 to lift the trophy in Lisbon next May.
A nightmare draw for City failed to materialise and, after two group-stage exits in the past two years, they would appear to have their best chance yet to progressing to the knockout phase.
Manuel Pellegrini's side will face holders Bayern Munich but also CSKA Moscow and Czech minnows Viktoria Plzen. Their odds shortened from 12/1 to 10/1.
Real Madrid are next in the market at 11/2. They will face Juventus, Galatasaray and FC Copenhagen.
Sky Bet trader Chris Spicer said: "Arsenal were already considered a far longer price than the other Premier League sides having failed to strengthen in the transfer market this summer, but now they face a tough task in even making the knockout stages.
"However, their impressive record of making it through the group stages warrants respect, so we make them marginally odds-on to progress, certainly a better chance than poor Celtic."
The Leeds-based firm also offer a market regarding which British club progresses the furthest in the competition.
Champions League group-stage draw:
Zenit St Petersburg
Matchday one - September 17-18
Matchday two - October 1-2
Matchday three - October 22-23
Matchday four - November 5-6
Matchday five - November 26-27
Matchday six - December 10-11