The Mirror says the midfielder will see his deal upgraded from 20,000-a-week deal to 60,000-a-week. The agreement will also extend from 2027 to 2030.
The new arrangement will also include a series of bonuses and objectives which will eventually see Mainoo become among the highest paid players at the club.
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The 18 year-old has established himself as a first-choice in his first season as a senior footballer.
He was again a starter for victory over Everton yesterday.