William 'Bill' Koop was an Australian rules football

Australian rules football

Australian rules football, officially known as Australian football, also called football, Aussie rules or footy is a sport played between two teams of 22 players on either...

er who played for Carlton

Carlton Football Club

The Carlton Football Club is a professional Australian rules football club based in Melbourne, Victoria. The club competes in the Australian Football League, and was one of the eight founding members of that competition in 1897...

 in the Victorian Football League

Australian Football League

The Australian Football League is both the governing body and the major professional competition in the sport of Australian rules football...

 (VFL) during the 1920s.

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

Northcote Football Club

Northcote Football Club, nicknamed The Dragons, was an Australian rules football club which played in the VFA from 1908 until 1987. The club's colours were green and yellow and it was based in the Melbourne suburb of Northcote...

's 1929 premiership team. He then enjoyed some individual success at Prahran

Prahran Football Club

Prahran Football Club, nicknamed The Two Blues, is an Australian rules football club based at Toorak Park in Orrong Road between High Street and Malvern Road, Armadale, in Melbourne, Victoria, Australia. Since 2007, the club has competed in D1 Section of the Victorian Amateur Football Association...

, 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'.