Salomon Kalou insists Chelsea are still capable of completing a league and Champions League double this season.
Chelsea looked back to their best on Tuesday night as they jumped into fourth position by beating Barclays Premier League leaders Manchester United 2-1 at Stamford Bridge.
Carlo Ancelotti was quick to play down suggestions the victory meant his side were back in the title race, insisting Chelsea's only hope of silverware this season was in the Champions League, where they hold a 2-0 lead over FC Copenhagen after the first leg of their last-16 tie.
But striker Kalou thinks otherwise and said: "We have to fight for both competitions, even though in the Premier League it will be more difficult to win it.
"We have to do like we did on Tuesday night, we have to keep believing and take it game by game.
"I think we are showing the good side of Chelsea because we can't just fight for one competition, we always fight for every competition."