It's not about, if PSG want or need to sell TS, it's about what he wants. We are trying to sign him since 2011, he "flirted" with Barcelona on several occasions, saying that it's his childhood dream to play for Barcelona and that he is a fan of the club. Last year when Milan finally decided to sell him, he was more or less forced to leave for PSG. Perhaps were Leonardo and Ancelotti the guys that made PSG an "acceptable" destination for TS, however both left this summer. In my opinion there is nothing that holds him there, except a Sheikh that doesn't want to give his dearest toy away. If TS wants to play for Barca, this is the last year that this transfer could happen, so it's on him to put a transfer. request in.