"I believe we can be fitter, and that is something we will be working hard on during the next fortnight," he said after the 1-0 defeat at Ashton Gate.
"We dominated the game against a team who didn't want to attack us.
"When opponents sit back, you have to be a touch more clever around their box.
"I want us to be able to steamroller sides for 90 minutes. I don't think we are currently capable of doing that."