Coker was given his marching orders having received a second yellow card in last weekend's 1-1 draw at Bury and now serves a one-match ban.
Midfielder Marc Laird and defender Julian Bennett both remain long-term absentees for a Shrimpers side who have gone five matches without victory, while visitors Rovers are currently four without a win.
Brunt has been sidelined for two weeks with an ankle injury and manager John Ward would like to partner the former Stoke man with Matt Harrold.
Clucas made a goalscoring appearance in the midweek game with Cirencester as he ups his comeback after seven months on the sidelines with a knee injury.
Matt Gill and Ollie Norburn all played their parts in the victory and they provide extra options for Ward as he looks to build on the late point against Hartlepool.
- Sports & Recreation
- Bristol Rovers
- Seanan Clucas
- Anthony Straker