In his final years as a Barnsley player, Hassell found games harder to come by but nevertheless always impressed when called upon. He was released by the club after ten years in May 2014. A year later in July 2015, Hassell was rewarded for his service to Barnsley with a testimonial match at Oakwell against Mansfield Town. The home side, featuring Hassell's former teammates from the 2006 promotion winning team, won the match 4–3. He is regarded as a club legend at Barnsley.