Ferreira damaged his anterior cruciate ligament on Thursday during training.
The former Porto ace has not been a regular at Chelsea, following the arrival of Jose Bosingwa in the summer.
Joe Cole will also be out for the rest of the season.
Ferreira damaged his anterior cruciate ligament on Thursday during training.
The former Porto ace has not been a regular at Chelsea, following the arrival of Jose Bosingwa in the summer.
Joe Cole will also be out for the rest of the season.
