The Red Devils are set to assess their squad and see who merits extensions or pay rises.
The likes of Garnacho and fellow youngsters Kobbie Mainoo may be in line for improved terms.
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Per The Mail, Garnacho is already committed to the club until June 2028, but may want a higher salary.
He has played nearly every game for the club in recent months, managing 49 appearances this season.
Garnacho, who may be at the Copa America with Argentina, still has the FA Cup final with United against Manchester City on Saturday.