Manchester United have completed the signing of Watford defender Harry Amass.

The Daily Mail says the 16 year-old has penned a four-year deal with United.

Watford had attempted to secure Amass to an early pro contract, but the teen chose to continue his career with United's academy.

Amass made the first team squad for their 2-0 FA Cup Third Round defeat to Reading last season, where he was an unused sub.

The teen is expected to be part of England's U17 World Cup squad later this year.