The son of former
Manchester United keeper Harry, John Gregg began his career with
Barnsley but did not make the first team there. He came to Carrow
Road in 1994 but made just one appearance for the Reserves.. He
also had a trial with Wigan Athletic. After a spell with Norwegian
side Fram from 1994 to 1996, John joined Glenavon in the Northern
Irish league alongside former Canary Youth team star Sean Collins . John moved on to Coleraine in October 1998
(12 appearances, 1 goal) before joining Ballymena United in August
1999 on a free transfer. In the summer of 2000, John impressed for
New Zealand side Dunedin Technical.
After returning to play for Cliftonville, he joined Institute where
he is currently their manager.