Robin van Perside scored both goals for the Gunners.
“To come here and win is fantastic for the team,” he told Sky Sports.
Arsenal are now seven points behind Chelsea and Liverpool at the top of the Premier League.
“It is much better but still not close enough,” said Wenger.
“But you know we can gain belief – we have beaten Man Utd, we have beaten Chelsea away and I believe that it shows we have potential, we have character, fantastic character in this side but we have now to be humble and come back tomorrow and do our job.”
