But the Tevez saga in particular undermined the manager - he said he would never play for the club again, but he did. For me, unhappy players are bad for a club. The player potentially puts less effort in and then you get questins why he is getting picked. If he doesnt get picked then he's twisting on the bench, being difficult in training or getting into other players.
He may just want a pay rise and might get it. Or this could be just being blown out of proportion. If its serious then it looks to me like he's looking for an excuse to move on and thats obviously a worst case scenario for City.
But you hear this "the club will decide" stuff from a lot of fans when a player is liked with a move away, but in the end, if he wants to go to a specific club and they want the deal as well, 9 times out of 10 it happens.
If Barca want him then it sounds like he wants to go back - having never actually wanting to leave in the first place and heading to city for the money. That's not a criticism by the way, simply an opinion.