And with the window now closed for well over a month, there remains some big names available to interested clubs. Here are some of the most notable:
Goalkeepers:
Keylor Navas - Costa Rica, 37 years old
Loris Karius - Germany, 31 years old
Tomas Koubek - Czech Republic, 32 years old
Etrit Berisha - Albania, 35 years old
Defenders:
Sergio Ramos - Spain, 38 years
Joel Matip - Cameroon, 33 years
Adama Soumaoro - France, 32 years
Kostas Manolas - Greece, 33 years
Ghislain Konan - Ivory Coast, 28 years
Daniel Amartey - Ghana, 29 years
Wallace - Brazil, 29 years
Koffi Djidji - Ivory Coast, 31 years
Serge Aurier - Ivory Coast, 31 years
Mário Fernandes - Russia, 33 years
Cedric - Portugal, 33 years
Bouna Sarr - Senegal, 32 years
Brandon Williams - England, 24 years
Filip Benkovic - Croatia, 27 years
Layvin Kurzawa - France, 31 years
Simon Kjaer - Denmark, 35 years
Midfielders:
Dele Alli - England, 28
Leonardo Lopes - Portugal, 25
Kevin Strootman - Netherlands, 34
Christoph Kramer - Germany, 33
Marco van Ginkel - Netherlands, 31
Roque Mesa - Spain, 35
Rafinha - Brazil, 31
Gaston Pereiro - Uruguay, 29
Eduard Michut - France, 21
Samu Castillejo - Spain, 29
Maxime Gonalons - France, 35
Francis Coquelin - France, 33
Forwards:
Eric-Maxim Choupo-Moting - Cameroon, 35 years old
Wissam ben Yedder - France, 34 years old
Alireza Jahanbakhsh - Iran, 31 years old
Mario Balotelli - Italy, 34 years old
Stefano Okaka - Italy, 35 years old
Kevin Gameiro - France, 37 years old
Mattia Destro - Italy, 33 years old
Santi Mina - Spain, 28 years old
Maxi Gomez - Uruguay, 28 years old
Adam Ounas - Algeria, 27 years old
Mariano Diaz - Dominican Republic, 31 years old
Isaac Success - Nigeria, 28 years old