Chelsea boss Carlo Ancelotti is convinced Manchester United can still slip up in the title race.
United's next two games are at Arsenal and against Chelsea and Ancelotti has insisted anything could happen in the next fortnight.
He said: "I lost a title nine points up with eight games to go. It can happen.
"It's not a nice feeling.
"It was very difficult to think two months ago that we could stay with the lead so for this reason, at this moment, we are happy."
