Doncaster captain Steve Foster is facing a long-term absence with a serious ankle injury.
Foster is a pivotal member of the Doncaster team
The central defender was stretchered off during Doncaster's LDV Vans Trophy win at Lincoln City on Tuesday night.
According to the club, an MRI scan has confirmed "massive ligament damage" which will be assessed further when the swelling goes down.
Foster missed just two games last season as Doncaster won the League Two title and is a key member of the team.