Carlo Ancelotti has warned his Chelsea side they must not become complacent despite restoring their five-point lead at the top of the Barclays Premier League with a resounding 3-0 win at Arsenal.
A Didier Drogba brace and an own goal from Thomas Vermaelen secured a seventh successive win for the Blues and dealt a severe blow to Arsenal's title hopes.
Chelsea's next league match comes against Manchester City at Eastlands and Ancelotti is adamant his players must maintain their focus and said: "It is important that Chelsea continue to play as we did (against Arsenal) with determination and concentration. We know very well our possibilities. We can win every game but also if we don't have determination and concentration, we can lose every game."
He added: "We have to maintain a good behaviour in our work. We started the season believing we could win it.
"When I signed a contract with Chelsea, I believed we could win something."
Arsenal were guilty of not making the most of their chances in what was a typically competitive London derby.
Ashley Cole, who went off with a suspected hamstring muscle tear towards the end, received a hostile reception on his return to north London and Frank Lampard appeared to have a fake camera thrown at him while he was receiving treatment in the first half.
The leaders out-muscled Arsene Wenger's young side in all departments, but Ancelotti believes there is more to his team than their physical prowess.
"We have this quality of strength and when we have to use this, we can," the former AC Milan boss said. "I think this team has a lot of technical, mental and physical quality.
"We didn't want to use physical quality, we wanted to use intelligence to defend in our half and there we won the game."
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