 After appearing for Watford's first team during the 2008 pre-season, on 12 August 2008 he made his competitive debut whilst still an academy scholar.Part of a weakened side for the League Cup, Gibson came on as a 60th-minute substitute for Jon Harley.Playing on the left-wing, he set up Will Hoskins for the only goal of the game as Watford beat League One side Bristol Rovers.