The Blues had two players (Jose Bosingwa and Didier Drogba) sent off in the first half against QPR at Loftus Road, a match they eventually lost 1-0, and the performance of the visitors with such a disadvantage was a surprise to Cech.
"I have never before played with nine men for such a long spell of time, at least I can't recall a situation like that," he told the club's official website.
"In the end it could have been even worse because we had seven yellow cards and anything could happen.
"It's a shame we did not win because in the previous fixtures we were in good shape. However, we started slowly.
"Under the circumstances in which the match was played, our performances with nine players on the pitch in the second half was fantastic and we deserved to equalise.
"After the interval I was rather a sweeper than a goalkeeper as I was outside of the box almost all the time trying to distribute passes."