Argentina internationals Fabricio Coloccini and Jonas Gutierrez will miss tomorrow's Barclays Premier League clash with Liverpool.
Central defender Coloccini has been ruled out with a groin injury, while midfielder Gutierrez has been allowed to return to his native country for personal reasons.
Steven Taylor, a potential replacement for Coloccini, is unlikely to have recovered in time from a hamstring problem, so Mapou Yanga-Mbiwa is in line to start alongside Mike Williamson.
Provisional squad: Krul, Elliot, Debuchy, Yanga-Mbiwa, Williamson, Good, Santon, Dummett, Tiote, Anita, Cabaye, Marveaux, Sissoko, Ben Arfa, Sammy Ameobi, Bigirimana, Vuckic, Cisse, Remy, Gouffran, Shola Ameobi.