Arsenal boss Arsene Wenger sees Alexis Sanchez in a central role.
Wenger must find cover for the injured Olivier Giroud.
"I bought Sanchez to be a striker and I think Walcott can be a good striker as well, Sanogo can be a good striker," Wenger said after their Champions League win over Besiktas.
"Podolski can play there and Campbell if you ask what he is, he's a striker. They are players of quality and we will see."
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