Career
Koop did not make much of an impact at Carlton in his four seasons but had a successful career in the Victorian Football Association. A key position defender, he was a centre half-back in Northcote"s 1929 premiership team He then enjoyed some individual success at Prahran, winning the 1931 Recorder Cup.
Koop was also a premiership player with Prahran in 1937.
The 146 game Prahran veteran was named, in 2003, on the interchange bench in their official "Team of the Century".