Harris has been told he needs an operation on a long-term shoulder problem and boss Paul Ince has confirmed he is likely to miss the next few months of action.
There is better news elsewhere for Ince, though, as he to tries to claim the three points which could see them return to the Sky Bet Championship summit ahead of Saturday's fixtures.
Midfielder Neal Bishop has recovered from the illness which forced him out of the starting line-up for last weekend's draw with fellow high-fliers Leicester.
- Sports & Recreation
- Paul Ince