Chelsea will once again be without Frank Lampard.
It had been hoped that Lampard would return to training this week after missing the last 10 games but the England midfielder will instead step up his rehabilitation from a hernia injury next week with a view to him playing some part in next weekend's match at Liverpool.
Alex will start tomorrow's match after missing last week's win over Wolves with a thigh injury but Ramires (ankle) and Yossi Benayoun (Achilles) remain sidelined.
Christopher Samba and Ryan Nelsen are set to return to the centre of the Blackburn defence for the battle with the leaders.
Samba will come back in to the side after missing last weekend's defeat to Liverpool at Anfield through suspension.
Nelsen, who has been missing with a thigh injury, trained with the squad yesterday and will return provided he suffers no adverse reaction.
Jason Roberts is also back in full training, but midfielders Steven Nzonzi and Vince Grella are out with hamstring and groin injuries respectively.
Blackburn (from): Robinson, Nelsen, Samba, Salgado, Jones, Givet, Olsson, Pedersen, Dunn, Emerton, EH Diouf, MB Diouf, Kalinic, Benjani, Roberts, Chimbonda, Hoilett, Linganzi.
Chelsea (from): Cech, Turnbull, Ivanovic, Bosingwa, Ferreira, Cole, Terry, Zhirkov, Essien, Obi, McEachran, Kakuta, Malouda, Anelka, Drogba, Kalou, Bruma, Mellis, Borini, Van Aanholt, Sturridge.