Australia international Jedinak missed last weekend's 2-2 draw against Birmingham through suspension after collecting five yellow cards.
Fellow midfielder Jonny Williams is back in full training after a groin problem, although Palace are keen not to rush him back after an injury-hit season.
Captain Paddy McCarthy remains a long-term absentee with the groin injury which has kept him out all season.
Defender Danny Gabbidon made his Palace debut as a late substitute against Birmingham and should be involved again.
But manager Ian Holloway is unlikely to tinker too much with a team who have lost just once in 19 matches and currently lie second in the table.