Salomon Kalou says Manchester United are Chelsea's biggest title threat. Despite Manchester City's money and Arsenal's potential, Kalou revealed last season's Double winners Chelsea still see Alex Ferguson's side as the main challengers to their top-flight throne.
And Kalou, who helped the Blues seal their berth in the Champions League last 16 with a 4-1 win over Spartak Moscow on Wednesday, said: "Other teams will be challenging but we still see United as our main rivals.
"That's why it was important to get qualification from the Champions League group out of the way quickly.
"Now we can concentrate on the Premier League and the FA Cup."
