Kobbie Mainoo said: “Manchester United has always been my home; this special club means everything to my family.
“I have grown up seeing the impact that our club has on our city, and I relish the responsibility that comes with wearing this shirt.
“From The Cliff, to Littleton Road, to Carrington and ultimately Old Trafford, the journey so far has been incredible. I have the privilege of living my dream every single day, with the same relentless desire to succeed here as when I joined my first training session at the age of six.
“We can all feel the momentum building inside the club. I am determined to step up and play my role in helping Manchester United to regularly fight for major trophies in the years ahead.”
