In 1995 he was signed by the newly founded Claymores to fulfill their contingent of National (non-American) players; NFL Europe rules required a number to be on the roster and at least one to compete in every other series of downs.
Couper, wearing uniform number 81, played in nine of the Claymores' ten seasons of existence, initially retiring in 2001 before making a comeback in 2003.
Couper amassed over 100 receptions and scored 10 touchdowns in his time with the club, and was voted the league-wide National Offensive Player of the Year in 1997.
[3] Couper was inducted to the Claymores' Hall of Fame on 24 June 2006 as part of the tenth anniversary of the World Bowl in Scotland celebrations.
[5] On 27 July 1997, Couper was included on the Chicago Bears roster for one of the "American Bowl" preseason matches against the Pittsburgh Steelers at Croke Park, Dublin.