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Firstly, fans need to get off Arshavin's back. The Russian may not be firing on all cylinders, but he's still a quality player. If the fans can get behind him, it will help his confidence greatly. Wenger has already shown great admiration for Arshavin, and if Wenger has faith in him, so should we.
Secondly, Arshavin needs to get back in the starting line-up. Although this will be a difficult task for him with Walcott and Nasri putting in some great performances recently, he still has the quality to do it. If he can put in some good performances off the bench Wenger might be tempted to start him.
Although it's unlikely to happen, a good solution would be to change around our formation to incorporate Arshavin into the team. Before moving to Arsenal, Arshavin played a supporting role for the striker, and I think he would be very effective at doing this for Arsenal. He is a great dribbler and would provide a different approach for breaking down defenses if our passing failed to work (much like Nasri when he was being played in the centre).
Wenger has made it clear that he wants to keep Arshavin during the January transfer window, but if his bad form keeps up until the end of the season, he could be tempted to sell him in the summer should he receive the right offer. This is what Wenger had to say when asked if Arshavin is leaving during the transfer window:
“I personally believe he is a great player – he is going through a period where it is more difficult at the moment. But he works very hard in training – his attitude is fantastic, and I am desperate to keep him"
Hopefully, Arshavin can rediscover his form sooner rather than later, and if he can he will play a critical part in the rest of Arsenal's season.