Oxford United manager Michael Appleton is a former Manchester United player and has scouted the young midfielder extensively.
The 21 year old box to box midfielder has agreed a two-year deal with the League one club.
The Manchester United academy graduate is a fantastic talent who is strong and powerful in his style of player. Rothwell is confident on the ball and excels with his dynamism and vision.
The youngster is famous for his driving runs into the box and excels when taking players on.
Rothwell has been a key member of the United U21 side and ability to help the team during transitions has been invaluable to the side.