Geoff was vice-captain when the Dons won the FA Amateur Cup in 1963. He joined from Woking in 1958 and quickly cemented his place at inside-right in a side that dominated the Isthmian League for the next six years. He was capped 20 times by England at amateur level and took part in a trial match for Great Britain.

He would have happily played out the rest of his career at Wimbledon, but when the club went semi-pro in 1964 he was deemed too old to be offered a contract, but took over the running of the reserve team and carried on playing for them as an amateur.