The Bulgarian missed Fulham’s home defeat to his former club Manchester United last week with a hamstring strain that has been keeping him out of training sessions.
Urby Emanuelson could make his first start if Berbatov misses out, while Fulham boss Martin Jol is still to assess the fitness of 12 players who spent midweek on international duty.
Costa Rica’s Bryan Ruiz, who scored a brilliant overhead kick equaliser against Panama on Wednesday, is only expected to return on the eve of the trip to Carrow Road.
Steve Sidwell (knee) and Kieran Richardson (calf) are available again, new signings Stanislav Manolev and Eyong Enoh are unlikely to feature after being made to wait for their work permits, while Mahamadou Diarra (both knee) and Kerim Frei (pelvis) remain out.
St Johnstone manager Tommy Wright has accused Neil McCann of deflection tactics as he denied reporting the Dundee boss to the Scottish Football Association.