Didier Drogba rates Arsenal as Chelsea's biggest threat to winning the Premiership this season.
He said: "When you look at this season in terms of the Premier League it doesn't look so good at the moment, because Arsenal are head and shoulders above us all and totally in charge of their football.
"The threat from Arsenal to all the other sides who think they might have the title in their sights is that they were already a team which played great football but we can all see that they are both more mature and more effective now than they were before.
"Even though I expect Chelsea to be capable of winning the league, I have to elevate Arsenal to the top group of favourites for the title because of the way they are performing right now."