The England midfielder was pushing to leave Old Trafford this month after a difficult first-half of the season.
Advertisement
Advertisement
However, Mainoo has now performed a U-turn and is ready to commit to United to the end of the campaign, says The Sun.
Mainoo and manager Ruben Amorim's relationship remains strained, but the youngster refuses to give up on his United career.
His contract expires in 2027 but United have the option of an additional year.
Attempts by United to open talks about a new deal were resisted by Mainoo last year.