Manchester City defender Kolo Toure has warned Manchester United that their defeat to Wolves could signal the start of a slump.
United saw their 29-match unbeaten record in the Premier League ended on Saturday when Wolves came from behind to win 2-1 at Molineux.
Toure, whose City side go to Old Trafford in Saturday's, was part of the Arsenal side that went through the 2003/4 campaign without losing a league game.
The Gunners struggled when their run eventually ended with a defeat to Sir Alex Ferguson's men and Toure believes the same could now happen to United.
Confidence"When you're on a good run like that and you lose, everything becomes harder. It shakes your confidence," said Toure. "Maybe that can happen to them. It was difficult to lose that game.
"The circumstances were hard because they got a penalty, which we didn't think was a penalty. For us, it was really difficult to lose to United. I think it's a great chance for me to get my revenge.
"I have spent most of my career in England battling United, first at Arsenal, now at City. They are always at the top.
"Now we have new players, we are capable of fighting against them and that has been shown with our results against them over the last 18 months."