The South Africa international missed last week's win at Portsmouth with a hamstring injury and, despite training this week, boss Mark Hughes admits the game may come too soon.
Rovers are more hopeful defender Christopher Samba, who limped out of the action at Fratton Park with a thigh problem, will recover in time.
Derby defender Alan Stubbs has had an operation on a knee problem and will miss the relegated Rams' two remaining games.
Boss Paul Jewell will also be without David Jones (calf) and Dean Leacock (hamstring) but Kenny Miller and Hossam Ghaly will both be fit for County's final away game.
Teams
Blackburn (from): Friedel, Reid, Nelsen, Samba, Ooijer, Warnock, Bentley, Emerton, Vogel, Pedersen, Santa Cruz, Roberts, Dunn, Brown, Tugay, Derbyshire, McCarthy, Mokoena, Khizanishvili.
Derby (from): Carroll, Moore, McEveley, Mears, Edworthy, Sterjovski, Savage, Ghaly, Lewis, Miller, Villa, Earnshaw, Todd, Beardsley, Feilhaber, Price.