"I think, in terms of setting a tone for the game, we couldn't have gone any worse - we lost the first eight headers all over the park. I don't care what level you're playing at, you can't afford to do that," he said after the 2-0 defeat.
"You learn a lot during a game and I learnt a lot today, about my team.
"Some of that I will keep to myself, but what I will tell you is that, even in a game like this, when you are going down a level or so - and I say that because I don't think you can say we went down two levels against Forest - is that you need quality players.
"We missed a bit of quality. I hope we have one or two players back next week, because we need them.
"But one or two players need to recognise that their performance was not good enough today and, unless they improve, they will not be anywhere near the first team."