The Cameroon international has suffered a muscle strain but David Luiz is back in training, while Mauricio Pochettino will hope to have Luke Shaw and Dejan Lovren available
Mohamed Salah's late strike ensured the Swiss giants completed a famous double over the Blues, who have now won just two of their last five matches in all competitions.
|8/1||Chelsea are 8/1 with BetVictor to beat Southampton 2-1|
David Luiz is also back in training for the Blues after a knee injury but will not be risked on Sunday.
For Southampton, a trip to Stamford Bridge represents another test of the top-four credentials which took a dent in defeat to Arsenal last weekend.
Artur Boruc in particular will be seeking redemption after his clanger allowed Olivier Giroud the easiest of goals to give the in-form Gunners a lead they never relinquished on 22 minutes.
Despite the result, Mauricio Pochettino's side have made a superb start to the season, with just two losses from their opening 12 matches leaving them in fifth place.
The visitors have injury concerns of their own, with starlet Luke Shaw forced off at half-time against the Gunners at the Emirates Stadium after sustaining a knock.
Pochettino will hope to welcome back defender Dejan Lovren, after he missed the Arsenal game with a sickness bug.
But the match is likely to come too soon for Jack Cork, who has a twisted ankle.