Lambert said: "A lad from AC Milan (Kevin-Prince Boateng) walked off during a friendly, didn't he?
"I think the players followed him off. It would have been interesting to see what would have happened had Manchester City walked off in a game of that magnitude.
"If it had been Villa...there's still no place for it and if my players had done it, I would have backed them. No matter whether we were winning, drawing or losing at the time. There's no place for it.
"I think that if someone draws a line under it and says, 'Right, this is what's going to happen'... If you take that stance and say, 'This is what we are going to do if it happens again', everyone will follow it."
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