Mainoo made his first England start against Belgium in a 2-2 draw on Tuesday.
The 18-year-old played a starring role in midfield alongside Declan Rice and Jude Bellingham.
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Post-game, coach Gareth Southgate told beIN Sport: "Just that he has had a fabulous week with us.
"Everything that we've seen with his club, he reproduced in an England shirt which isn't always the case.
Very calm, receives the ball so well under pressure, strong, so we are a little bit more open playing that way but the benefits with the ball were clear to see."