Caretaker boss Keith Millen has revealed Crystal Palace midfielder Adlene Guedioura will be sidelined after puncturing a lung and breaking two ribs.
The 27-year-old collided with West Bromwich Albion keeper Boaz Myhill during the 2-0 defeat on Saturday.
"It doesn't look good for him - he's fractured two ribs and it's damaged his lung as well," Millen told Advertiser Sport.
"For cracked ribs, you're looking at around at least six weeks out.
"The trouble with cracked ribs is that you can't exercise and you can't get your heart and lungs going.
"Some injuries, you can keep your cardiovascular fitness up, but with this injury you can't do anything.
"In four weeks' time, if he can do some exercise and it's not aggravating him, then great, he can."
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