When Tevez has been fully fit he's been fine. When you see him start to struggle towards the end of a game, he's usually below par in the next one. It's because he's clearly had a niggle of some kind which has got worse.
He's the kind of bloke who will try to play through it, as he did v Chelsea when he wanted to play without being fit. Had he played & not had a great game, people would be saying it's because he's not arsed. Tevez would be arsed playing for Stockport County; he doesn't 'do' not arsed. He will try to play before the end of the season. He may play; he may not be fit. He may play; he may be fit.
If he's fit he'll be the same Tevez as he was last year; fucking tremendous, whether he's leaving or not. If he's carrying an injury, he'll be below par. It has nothing to do with his transfer request. That is simply not true.