The French league is not the Premier League; there be a period of adjustment in terms of both the quality and the physicality.
Players like Mainoo are anomalous and expecting an 18 year old to walk right into a squad competing for a top position in the toughest league in the world is a hell of an ask.
We are clearly trying to build a team for the future with players like Hojlund, Garnacho, Amad, Mainoo, and Yoro and the last thing I want to see is this kid thrown to the wolves straight away just because this club doesn't know how to conduct proper transfer business.