The centre-back joined the club from Chesterfield in the summer of 2014, after catching the eye in a pre-season friendly against the Whites.
Cooper, a product of Hull City’s Academy, has been a regular fixture at the heart of the United defence since his arrival. The Scotsman has made 160 appearances for the club, the most in the current squad.
Cooper was appointed club captain by Marcelo Bielsa ahead of last season and he led the team to an impressive third place finish. He played 38 times in the 2018/19 season and scored three times.