The 2011–12 season saw Gillett regained his first team place at the start of the season and scored his first Doncaster Rovers goal on 27 September 2011 against Hull City. Gillett then scored his second goal for the club on Portsmouth on 22 October 2011. On 3 December 2011, Gillett played against Southampton for the first time in his career, as Doncaster Rovers won 1–0. Gillett later scored the third goal of the season on 21 April 2012, in a 2–0 win over Coventry City. The 2011–12 season saw Gillett established himself in the first team at Doncaster Rovers and played every matches throughout the season, as the club were relegated to League One. Despite Doncaster Rovers' relegation, Gillett was awarded for the South Yorkshire Writers' Player of the Season. However, Gillett was released by the club.