Chelsea goalkeeper Petr Cech says they must be wary of Sunderland this weekend.
Cech believes Chelsea must be alert to a side that showed its capabilities with a battling 1-1 draw at Tottenham on Tuesday night.
"It is a dangerous game because usually they are quite tough to play when they are away from home," he told the Chelsea website. "They have good players and have been together for some time now. They will be dangerous on the counter-attack and this is another game where they will expect to be defending and waiting for counter-attack opportunities so we know we have to be ready for that."
