Arsenal boss Mikel Arteta admits Thursday's clash with Benfica will be decisive in their season.
The Gunners host Benfica in the second-leg of their round of 32 Europa League tie with the aggregate score locked at 1-1.
Despite the pressure, Arteta says its a game his players need against a team he regards Champions League class.
The manager also leapt to the defence of captain Pierre-Emerick Aubameyang as he continues to battle for form.
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