#1 Mesut Özil
For sometime now, both Mesut Özil and Alexis Sanchez have been linked with moves away from the Emirates, but Arsenal has somehow held on to their star attacking duo.
With their contracts running out in the summer, there is a very real possibility of Wenger losing both of them.
Manchester United and Barcelona have been sniffing around the German playmaker, and you can never rule out the possibility of a move back to the Bundesliga.
Ozil is often very heavily criticised for his defensive work rate, but he will probably be the undisputed first choice at Arsenal as long as he's fit.
But the Gunners have been stuck in something of a downward trajectory for a couple of seasons, unable to really challenge for the Premier League. Their only real success has been in the FA Cup, a tournament that is starting to lose relevance and importance with every passing year.
Ozil's most productive years came with Real Madrid, and his hunger for more silverware might be enough to make him listen to offers in January.
He will be free to start negotiating contracts with other clubs in January, and that seems the best option right now. Arsenal might regret not renewing his contract sooner, but Ozil needs to start playing at the top again before an inevitable decline in a couple of years.