The Red Devils have agreed a deal with Juventus to pay £15million for the 27-year-old France star.
But now comes the tough part — sorting out personal terms with his fiery agent and mother Veronique.
Previously, she has clashed with sporting directors, demanded to meet managers and attend training sessions.
And more nightmare negotiations are the last thing United need following a frustrating summer trying to land key targets and a disastrous opening-day defeat to Brighton.
Veronique wanted to go on a pre-season tour after her son signed his first pro forms with Paris Saint-Germain.