The 18-year-old only returned to full fitness last November after sustaining an injury in pre-season and has already become one of the best players in the Premier League.
Mainoo scored his first-ever league goal in style on Thursday, grabbing a late winner in the 4-3 victory over Wolverhampton Wanderers as his breakthrough campaign continued.
The Man United academy graduate scored his first goal for the club in the FA Cup at Newport County last Sunday and is slowly becoming undroppable in manager Erik ten Hag’s starting XI.
Mainoo signed his first professional contract shortly after his 17th birthday in May 2022, signing a new deal a year ago.
While another extension is not on the cards, the Red Devils want to offer him improved terms at the end of the season.
The England youth international has impressed the staff and his teammates with his composure and maturity beyond his years, and his adaptation to senior football has been seamless.
Mainoo has featured in 12 games across all competitions but has already done enough to convince Man United that he deserves fresh terms.
A clause in his current contract saw him double his weekly wages when his first-team appearances hit double figures.
Substantial bonuses every time he is included in the matchday squad are also part of the deal, with appearance and win clauses included.
His current contract expires in 2027, but there is an option to extend it by 12 months, and he will get an extension before then if he keeps up with his current level.
He was earning £10,000 per week before it was doubled to £20,000, and his wages will further increase once he is an established member of the first team, which is expected to happen at the end of the season.
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