Michael Ballack has revealed that Chelsea's players have held a training ground inquest into the defensive errors which are threatening to disrupt their season.
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Goals like James Collins' winner have blighted Chelsea's campaign so far
Chelsea lost 2-1 against Aston Villa last Saturday, their second successive away defeat, with both goals being conceded from corners.
Captain John Terry was furious with their set-piece mistakes and midfielder Ballack, who missed the game with an ankle injury, revealed the squad are determined to put matters right, starting with Wednesday's Champions League tie with Atletico Madrid.
"John's reaction on the pitch showed that he takes a big responsibility not just for himself but for the team," said Ballack. "He was really disappointed when we conceded the second goal.
"That's what you need, emotions like that, to make sure it doesn't happen again. We speak with each other. We have no problem criticising each other in the dressing room. A good team with strong players has to do this."
Meanwhile, boss Carlo Ancelotti admits Chelsea have not been at their best in the Champions League despite a 100% record in the competition so far.
Chelsea are top of Group D having won both their opening games against Porto and Apoel Nicosia but the Italian coach is looking for a distinct improvement against Atletico. The Spanish side have made their worst start to a league season since the beginning of the 1994 but Ancelotti is wary of writing them off.
"Atletico have not started the season well, but they have a very good quality. In attack they have Sergio Aguero and Diego Forlan who are dangerous strikers. We have to pay attention to this.
"Aguero has fantastic quality and he can resolve the match with his quality. They're a good team but, at this moment, they haven't found a good disposition tactically on the pitch.
"I think that Atletico has a possibility to return to playing well because they have a lot of quality. Now, at this moment, for them it's not easy because Porto have also made a good start.
"It's a very important game. Not only to get back to winning ways after Aston Villa, but to stay top of the group and move to nine points. This will make the next three games in the group easier."
