Man Utd secretly inserted Mason Greenwood buyback clause into Marseille transfer deal
![Man Utd secretly inserted Mason Greenwood buyback clause into Marseille transfer deal](https://i2-prod.mirror.co.uk/sport/football/transfer-news/article33296109.ece/ALTERNATES/s615/0_GettyImages-2162020496.jpg)
Mason Greenwood has joined Marseille on a five-year contract after Manchester United decided he couldn't continue with the club, but they have left the door open for a possible return