AS Roma coach Eusebio Di Francesco felt let down by his players after their Champions League defeat to Viktoria Plzen.
Having already qualified for the round of 16, Roma fell 2-1 on Wednesday.
“These games help us to reflect and I did not get the response I wanted," Di Francesco told Sky Sport Italia.
“We started well controlling the ball, but then allowed them to cause us big problems and we cannot afford that, even if for Viktoria Plzen it was the last chance saloon.
“I don't know if it's a general moment of difficulty, but it's true to say we didn't defend collectively. The biggest fault is to concede too much and not defend consistently. It allowed Plzen to get the better of us and that should not happen.
“We expect a different performance from everyone, I wouldn't talk about individuals."