Joe Hart has warned Chelsea that Manchester City are determined to get their own back for a Premier League defeat at Stamford Bridge in December, and says Carlos Tevez can be a like a new signing in the title run-in.
City's first loss in the league this season came against Andre Villas-Boas' Blues before Christmas and they will have the chance to gain revenge when the teams meet again at the Etihad Stadium on Wednesday.
Hart recognises the importance of securing victory after falling four points behind Manchester United at the top of the table, even if it will be a tough game against a Chelsea side that has been in fine form since Roberto Di Matteo replaced Villas-Boas.
He said in The Sun: "One result can literally change everything. It's madness but it's great. Being four points behind won't have any bearing on how we play.
"We owe them one. They were the first team to beat us in the league this season.
"We didn't feel we were outplayed but we lost Gael Clichy to a red card, we could have had a penalty... there's a lot of could-haves and should-haves.
"But we lost the game and now we need to beat them."
City do not have the same sort of experience as United in terms of challenging for the title but Hart believes they are still capable of becoming champions.
He explained: "I've never won one so it's hard to know what a title-winning side feels like. But we've got a good spirit, good attitude.
"And I'm sure anyone who has won a title will tell you that's what is required.
"We have all the ingredients. All we're short of is the medal round our necks."
Hart feels the return of Tevez could help propel City towards major honours, with the Argentine striker set to feature against Chelsea after a six-month absence from the side.
Tevez had looked set to leave the club following his refusal to warm up in a UEFA Champions League clash with Bayern Munich in September, but recently came back from an unauthorised spell in his homeland and apologised for his conduct.
Hart said: "I haven't actually trained with him. But those who have assure me he's doing really well.
"It's down to the manager to assess it. But a fully fit and firing Carlos has got to be a positive for us.
"We've got energy in the team and we've got a lot of firepower. But Carlos brings us more of that.
"The strikers who are here now have got us in a position where we could get a record points tally in the league.
"But having Carlos back will be like a new signing. That's a good way of putting it."