Borussia Dortmund coach Jurgen Klopp is wary of the new-look attack of Champions League opponents Arsenal.
Klopp is impressed by Arsenal's swoop for Danny Welbeck and Alexis Sanchez.
He told the London Evening Standard: "They have signed two outstanding players in Danny Welbeck and Alexis Sanchez, who will give them even more pace.
"I'm expecting the Gunners to try and utilise this on Tuesday. But first and foremost, both teams will have to be fully focused and defend well."
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