He has played under Tuchel at Mainz and he will join them on a free. Seems strange, but I think this will actually happen.
It makes sense if he's played under Tuchel already. He's not a bad little player & on a free would be a good squad option against the shitty teams in Ligue 1. Surprising but at the same time not surprised if he's already played under the PSG boss & he's a freebie