West Ham United are concerned about their prospects of securing Jesse Lingard permanently.
The England attacker excelled with the Hammers after joining on loan from United in the winter transfer window.
There is no-buy option within the deal, which means West Ham must make a suitable offer to United for Lingard's signature.
According toThe Sun, West Ham boss David Moyes fears he may miss out on a player who scored nine goals in 16 games for the club.
United want a decent fee for Lingard, and manager Ole Gunnar Solskjaer may even welcome him back into the first team squad.
From Lingard's perspective, the 28-year-old is seeking assurances over playing time before returning to Old Trafford.
If their isn't a regular place in Solskjaer's side, it is likely Lingard will try and force a permanent exit from his boyhood club.