In the 2013–14 season, Sadler continued to regain his place in the first team, under the new management of Richie Barker. Sadler then score his first Crawley Town goal of the season on 17 August 2013, in a 2–1 loss against Rotherham United. Then on 21 September 2013, Sadler then provided assist for Emile Sinclair, in a 1–1 draw against Colchester United. Sadler made his 200th consecutive league appearance on 12 April 2014 against MK Dons. Like his first season at Crawley, Sadler was, once again, to be an ever-present player in the League One season to play every minute of every game for his club, as he helped the club finished fourteenth place.