Portsmouth defender Carl Dickinson needs an operation on his injured knee.
The on-loan Stoke defender missed Tuesday night's defeat at QPR with the problem and could now face a lengthy spell on the sidelines.
"Carl will be going in and having a knee operation. It could be short-term or long-term," said Pompey boss Steve Cotterill.
"He will definitely have to have something done, it's just the severity of what he has to have done."