Carlisle boss Greg Abbott will assess the fitness of Lubo Michalik before deciding if the on-loan Leeds defender will face Charlton.
The big Slovakian, who has missed the last three matches with a hamstring injury, was able to train on Thursday.
Abbott rates Michalik as a major doubt but has stopped short of completely ruling him out. Peter Murphy will continue if Michalik fails to make it.
Mike Grella is in contention for a place in the starting line-up after an impressive debut off the bench in last weekend's 2-1 defeat to Exeter.
Winger Matty Robson, who scored United's goal in Devon with a superb 35-yard free-kick, is also pressing for a place in the team.