Taking league squad registration into consideration.
September's List (-Ba, 21 players):
Romain Amalfitano, Shola Ameobi, Vurnon Anita, Demba Ba, Hatem Ben Arfa, Yohan Cabaye, Papiss Cisse, Fabricio Coloccini, Robert Elliot, Dan Gosling, Stephen Harper, Jonas Gutierrez, Timothy Krul, Sylvain Marveaux, Gabriel Obertan, James Perch, Daniel Simpson, Ryan Taylor, Steven Taylor, Cheick Tiote, Mike Williamson, Xisco.
January additions (4):
Debuchy, Yanga-Mbiwa, Sissoko, Gouffran, Haidara (U21, need not be registered)
So we've filled the available slots for Febuary's squad registration.
Possible summer departures (4):
Simpson, Xisco, Coloccini, Harper
Turning 22 next season, needs registration (3):
Santon, Ranger, Ferguson
So one available slot pending any departures. If we follow up on PEA, that's the final slot filled. I can see a few departures besides the usual suspects, especially in areas we are well-stocked in, such as central midfield.
Afaik, any players we loan out are included in the 25-man list (Xisco was included while at Deportivo) and if there is available slot(s), all over-21 players have to be registered and can't be left out (Owen at Stoke).