Even if he is still a city player he wont be playing in this because of the Copa America, similarly if we were to sign Aguero he wouldn't play either.
If Tevez is still a city player and plays against Swansea then I will support him the same as I would have done last season for three reasons. One, he is wearing a city shirt, two because he has been arguably the best player to play for City in my lifetime, and three he always gave 100%.
I am surprised at some peoples reaction to his wish to leave. It is disappointing but he hasn't offended me as a supporter. Granted he said he didn't really like Manchester, but that's his (somewhat uninformed) opinion. If I ever see him play again, for or against us, I will applaud him.