The Seasiders' seven-match unbeaten run came crashing to a halt as the Hammers ran out 4-1 winners at Bloomfield Road on Tuesday, despite having goalkeeper Rob Green sent off early in the second half.
Holloway was critical of his players' approach against the npower Championship leaders and could ring the changes at Ashton Gate.
"We've got to get our minds off what could happen and where we could be because there was one team that had its mind totally on its job and it wasn't mine unfortunately," he said. "I think our lads actually tried to out-football West Ham completely on a pitch that wasn't like that.
"We kept sticking it in to (Lomana) LuaLua's feet and he kept giving it away. It was like, `hang on, what are we trying to do here'. I think we were looking at what could happen instead of making it happen, whereas their team made it happen.
"We've got Bristol City away on Saturday. Tuesday was a reality check for all of us at the club because none of us expected our team to look like that, whoever I pick. I've got to have a good look at that."