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Players: Olivier Giroud, Yaya Sanogo, Alexis Sanchez, Theo Walcott, Joel Campbell
Arsenal desperately needed another striker last summer; they didn't buy one. Arsenal desperately needed another striker this summer; they sort of bought one.
While Olivier Giroud will assuredly be the Gunners' regular starter, he needed backup to relieve his physical burden and provide some competition. While Alexis Sanchez can play in the middle, the weight of being Arsenal's lone striker will have to be borne by more than two players.
Smaller strikers cannot play alone up front in the Premier League due to the size and physicality of defenders. So while Giroud or Yaya Sanogo can fill the role by themselves, Alexis or Theo Walcott will need assistance.
Giroud is much better than people give him credit for and Sanogo looks like a very promising talent, but Arsene Wenger will need to be tactically creative for Alexis to be effective by himself.