After Burnley's relegation, Duff remained with the team and, over the next three seasons, was a frequent, though not automatic, first team choice as injuries and competition for places saw him play in roughly half of Burnley's league matches in each of the seasons through this period. By the summer of 2013, having earned a season extension for 2013–14 on the basis of his appearances, Duff was the longest-serving player at the club. On 2 July 2014, Duff signed a new one-year contract with Burnley, Duff remained the only survivor of the squad that reached the Premier League in 2009 and his final deal meant the former Northern Ireland international entered his 11th season with the club.