Frank Lampard believes Chelsea need to win all of their remaining fixtures if they are to defend their Premier League title.
The Blues are in danger of seeing the Premier League crown they secured in 2009/10 slip through their grasp.
Thirteen points currently separate Carlo Ancelotti's side from leaders Manchester United, although they will get the opportunity to cut that gap in Monday's derby date with Fulham.
It is imperative they take maximum points from the Cottagers clash, with it vital to build momentum heading down the final stretch.
Lampard is well aware of that, with the midfielder of the opinion that Chelsea may have to win 13 games in a row in order to come out on top.
He said: "We know we can get back into the picture. It will take a huge effort because we need to win all our games and hope other clubs slip up.
"We can't afford to think about United too much. Our aim is to get a run of wins together so that we can close the gap before we play them.
"It will only swing our way if we can get it down to around six points before we play them."
Chelsea are due to play host to the Red Devils on 1 March and will go to Old Trafford on 7 May.
Lampard admits those ties could be pivotal, with the Blues desperate to avoid ending the season empty-handed.
"The desire is still there in the dressing room, there is no doubt about that," added the England international.
"Winning things is like a drug. When we win Premier League titles and FA Cups we want to keep that feeling of success.
"The players are fully aware that we had a terrible run during November, December and even into January. Football seasons can be like that.
"This is the moment when the big players and the big personalities stand up. The two games against Manchester United will be massive, but whether they will decide the title or not, I don't know."