Watford full-back Ryan Andrews has agreed a new four-and-a-half-year contract with the Championship club.
The 19-year-old has made 12 appearances this season and scored his first senior goal in a 2-0 win over Birmingham City.
He has also won three caps for England's under-20 side and played against Germany earlier this week.
"I've worked so hard to get to where I am now, but I'm not finished and there's a lot more to be done," he told the club website.
"This is my first full season with the first team, although I was with the senior squad towards the end of last season.