Sunderland's Gus Poyet hopes he can sign three players by the weekend after becoming frustrated by a lack of new faces.
Nigel Pearson is hoping to further bolster his ranks at Leicester and says he has no intention of letting anyone leave.
Martin Jol defended his record as Fulham manager after recurring errors heaped further pressure on his position.
Six months will have elapsed between Barclays Premier League home wins at Craven Cottage, even if Jol steers Fulham to victory over Stoke and predecessor Mark Hughes next Saturday.
Fulham, whose last home win in the top flight was against QPR on April 1, failed to follow up the Capital One Cup defeat of Everton by defeating Cardiff, as the Welshmen claimed their maiden Premier League away win with a 2-1 success.
Jol, whose contract expires at the end of this season, guided Fulham to ninth and 12th-placed finishes in his first two campaigns, but his side are now in the relegation zone.
The Dutchman said: "We have to do better, but I can't go on the pitch and do it myself.
"We beat (Everton), but it's the Capital One Cup, it's not the Premier League. And in the Barclays Premier League you have to win your games.
"Everyone who is in the bottom three or bottom five is concerned. There's always pressure.
"I take responsibility, because I took all these players on board.
"It was not easy, because we don't have all the millions but I still feel that we did well to get the (Darren) Bents, even (Dimitar) Berbatov.
"(But) it's not good enough to win games sometimes.
"It's not about me. If you're in the bottom three or four you're under pressure. I try to make people happy and most of the time I've done that."
Unfortunately for Jol, who saw Scott Parker depart with a calf injury early on, familiar failings were the undoing of Fulham, errors which may not be tolerated for much longer.
Fulham owner Shahid Khan, the American billionaire, may act decisively, just as he did when removing the Michael Jackson statue installed by his predecessor Mohamed Al Fayed.
Steven Caulker headed Cardiff in front from an early corner while unmarked before Jordon Mutch's late winner, sublime though it was, featured a lucky break off Kieran Richardson.
It had looked as though Bryan Ruiz, moments after stepping off the substitutes' bench late in the first half in a tactical change, had earned the Cottagers a point before the second late lapse in successive home Premier League games prompted loud booing at the final whistle.
Former Tottenham, Hamburg and Ajax boss Jol added: "It's tough to take, but it's a structural thing, that's the disappointing thing.
"You've got good intentions, we've got all the size in the world.
"We work on it, we talk about it, we try to do better and then they've got clear headers on goal. That is awful.
"With the players we've got at the back, sometimes defensively, especially in the air, we can do better."
Jol fielded Brede Hangeland and Fernando Amorebieta in central defence and expected better.
"That was not probably our best pair," he said.
It was Cardiff's second win of the campaign following the defeat of Manchester City and ended a four-match winless run.
Manager Malky Mackay felt his side were deserved winners and praised the new additions to his squad for making a difference.
Caulker captained the Bluebirds at Craven Cottage and performed well, but Mackay was also impressed with midfielder Gary Medel, right-back Kevin Theophile-Catherine and Peter Odemwingie.
Mackay said: "He (Caulker) is very comfortable at this level; we were delighted to get him.
"I look to get as many captains on the pitch. Gary Medel's an obvious choice, as and when he learns English, because he's a born leader.
"Medel ran the whole game; he orchestrated the whole game.
"Theophile-Catherine at right-back is an outstanding piece of business. He's come in with minimum fuss and maximum energy.
"He looks as if he's been playing at right-back for us for years.
"Odemwingie wasn't match-fit coming to us, but was a fantastic talent and someone we knew could help us.
"He looks incredibly dangerous in the opposition half and people back off when he gets the ball.
"We were delighted to get him in as well."