Capper turned professional with hometown club Wrexham in 1949, with his first appearance in The Football League coming against Grimsby Town in 1952–53.
[1] When Capper left Wrexham in 1955 after 48 league outings he was awarded a benefit match.
[1] After a short spell with non-league Headington United, he returned to professional circles with Lincoln City in January 1956.
[1] After struggling to command a regular place at Sincil Bank, Capper moved to Chester in September 1959 for £1,500.
[1] He competed with the centre back position with George Spruce[1] before retiring from the game through injury in 1961.