Cech was lamenting their Champions League exit last night.
The club's stand-in captain had no doubt where Chelsea had gone wrong in their campaign.
"Recently, we've been defending much better," he said. "But, throughout the competition, if you concede two goals everywhere then it's very unlikely you're going to win games.
"Throughout the group stage, we played well when we had the ball.
"We were suffering a little bit without the ball, conceding too many shots."