Carlo Ancelotti declared Chelsea could complete a sensational late comeback in the Barclays Premier League title race if Manchester United lose two more matches before the end of the season.
But the Blues boss admitted his own side also needed to win all five of their remaining games to retain their crown.
Chelsea took a small step towards the most improbable of late surges by beating Birmingham 3-1 at Stamford Bridge to leapfrog ailing Arsenal into second place and close to within six points of United.
The leaders are still firm favourites to finish top, but have to play both of their closest challengers in the next three games.
Ancelotti said: "To win the title we'll need less points than last season.
"We won it with 86 last season. Now, with 80 points, United can win the title. They need 10 points. In football, I learned that everything can happen in the game right up to the final whistle."