"It's very frustrating and no consolation to think that we had 65 per cent of the play," he said after the 2-1 defeat at the New Den.
"We are all right when we have the ball, but we're finding it hard when people throw hopeful balls into the box.
"I thought Millwall's first goal came against the run of play and for their winner, we felt there were two players in an offside position who were well off."