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Sell Theo Walcott
First off, Arsenal need to make a decision on forward Theo Walcott, and for the sake of the club, it's best that they get rid of the England international this winter.
His price will attract plenty of suitors who are looking for a wide striker to complement their attacking corps, and his contract saga has gone on long enough for the Gunners to realize that Walcott isn't worth the heartache that he is currently causing.
The north London club needs to make some wholesale changes this summer; disposing of excess baggage such as Walcott is a good place to start.
Buy Demba Ba
Speaking of wholesale changes, Arsene Wenger should give everything he can to bring Newcastle United striker Demba Ba to the Emirates this winter.
We know that the Magpies' frontman has a release clause in his contract which could allow for a club like Arsenal to pick him up on the cheap, and with Papiss Cisse waiting in the wings at Newcastle, Alan Pardew might be willing to sell Ba for the right price this winter.
Olivier Giroud is starting to look good up front, but the Gunners need further assistance with Gervinho sputtering and Lukas Podolski best served in the middle. Signing Ba would be a great complement to their squad this summer and would give Santi Cazorla a clinical finisher ahead of him to thrive on.
Look for midfield assistance
One more need for the Gunners is to continue to solidify their midfield, which might seem bizarre given the talent they currently have in there.
But especially in terms of defensive midfield, where Abou Diaby isn't turning out to be what the north London club need, Wenger might do well to bring in further strength and composure in the middle, which will hold them in good stead against the top teams in Europe and England this season.
Kevin Strootman is the man most talked about as a possible transfer here.