 However, following the 2008 season, Khan was named as one of the members of the "Development squad" of fringe players, to be sent to India as back-ups to the main England squad, because he had "impressed with his pace and swing".He gave away 16 runs in his first and only over during the Twenty20 Cup Semi-final, where Marcus Trescothick smashed four successive boundaries.Khan joined Sussex for the 2011 season replacing Corey Collymore 

On 20 March 2014, Sussex announced they had released Khan after his 2013 season was disrupted by injury.