Former Arsenal forward Charlie Nicholas believes Sunday's North London Derby clash with Tottenham is of more importance to the Gunners' season than their 5-1 Champions League loss to Bayern Munich on Wednesday.
Arsenal's hopes of progressing to the knockout stage of the Champions League took a big hit following the heavy defeat to Bayern.
However, Nicholas believes his former club's focus should be on maintaining their lofty position in the Premier League when they take on their bitter rivals this weekend.
"Arsenal have a real momentum and belief that they can challenge for the Premier League this season," Nicholas told Sky Sports.
"Ozil's form is much improved, we know what Sanchez gives you, and Giroud gets another goal tonight. Of course in two weeks time, you'll have Walcott coming back, and Ramsey coming back.
"It's a much more important game [against Tottenham]. This is about survival in the Champions League at the moment. If it doesn't happen, it doesn't happen.
"Arsenal's seriousness this season is in the Premier League."
