I'm really sorry, I've got no source here, because I've just read Keegans qoutes in the paper in Tesco's.
Keegan says when he first came back, some players in training wanted to hurt each other (hard tackles etc), and that he had to say something like 'you can't do that, you might have to play with him on Saturday'
Sorry I've not got the source, so when someone gets it, feel free to add it here.
Reminds me of when Nicky Butt had a few words to say about the people who were playing and acting like they didn't want to be here (the day Zoggy and Oba?, walked out on the team) * apparently.