John had to retire in 2000 due to a hamstring injury.
John narrowly missed out on Commonwealth gold in 1990 when his training partner Marcus Adam pipped him to the title.
He feels that Dwain Chambers, Mark Lewis-Francis and Christian Malcolm all have great chances of grabbing gold for Britain this year.
He also backs Kelly Holmes, Steve Backley and Jonathan Edwards to achieve glory.
Away from the track John also enjoys golf, tennis and martial arts.
John now runs his own sports management company and his cousin Cyrille played international football for England.