The Reds were on the wrong end of a 5-0 thumping at Turf Moor, but Cohen knows his side cannot afford any more slip-ups in their bid for survival in the Championship.
He told the club's official website: "We just weren't good enough and we have to address that. We've got a massive game on Saturday but the thing is now we are not in the middle of the season where we can afford to go on any bad runs or anything like that.
"It's now crunch time, we know where we are in the table and we know we can't afford any more days like that or any more losses really.
"We need to start winning some games and we need to go into the Wolves game, although it's a tough game as they are top of the table, with confidence and try to take away a victory to cancel out this week's misery.
"We know we're capable of winning it but we've got to do miles better than we did on Saturday."