With Gael Clichy's departure not expected to be on the only big player to leave Arsenal this year, this transfer window is a huge one for Arsenal in not only their bid to challenge for trophies but to maintain their top four position.
Leighton Baines - The Everton full back has been the personification of consistency for along time now, and after playing every minute of the 2010-11 season, the England international is a wanted man. As good in his own half as he is the opposition Baines would suit the way Arsenal play and is arguably a better defender then the departed Gael Clichy.
Other possible targets - Jose Enrique and Emilio Izaguirre
Jan Vertonghen - Arsenal need to add a centre back to their ranks, after basically a whole year without key centre half Thomas Vermaelen they struggled defensively. Ajax centre half Vertonghen has played with Vermaelen at both club and international level and the two would forge a could partnership. A mistake from Wenger last year was to allow William Gallas to leave the club who performed well for rivals Spurs last year.
Other possible targets - Christopher Samba and Scott Dann
Possible Arsenal side
Sagna Vertonghen Vermaelan Baines
Wilshere De Rossi
Gervinho Van Persie Arshavin