In commemoration of his seventeen-year career with Doncaster, Coppinger was commissioned to design the club's third kit in support of the CALM charity. The team wore this for the first time in a home match against Hull City on 20 February 2021. Coppinger came on as a second half substitute and scored a direct free kick to equalise in stoppage time. On 6 March 2021, Coppinger became the first player to reach 600 league appearances for Doncaster Rovers, setting up both goals in a 2–1 win against Plymouth Argyle at the Keepmoat Stadium. He is the 21st player in Football League history to reach this milestone.