Bristol City head coach Gerhard Struber said his side should be beating League One strugglers Port Vale, who they were knocked out by in the FA Cup fourth round.
City created just two shots on target and were forced into extra time by the side bottom of the third tier, with Ben Waine scoring their winning goal in the 112th minute.
"Really disappointed, we had a completely different plan to jump in the fifth round and again it was in big moments, in these basics [we were] not on top, especially when we realise chances, that we are ready to bring the ball in the net, we miss here a little bit," Struber told BBC Radio Bristol.
"Then we get cheap goals against us, when you look at this goal how we get it it's a long ball, lose the first duel and then it was not connected enough.
"We have some new players in the backline and we have to create a good wall but I'm really unhappy how we deal in this moment.
"We know FA Cup is always a little bit special but we have to win this game, this must be our clear standard and we don't jump in this direction."
Struber also confirmed George Earthy missed the game due to an injury that could keep him out of the squad for two to three weeks.
"He has something on the ankle and he's injured, we have to look and if it's not so bad maybe two or three weeks - after the international break maybe he is back," he said.