Arsene Wenger has explained why he substituted Alexandre Lacazette after 65 minutes.
The Frenchman was impressed by the striker's performance, but felt his side needed fresh legs up front.
"I felt Lacazette had a very good first half. He worked very hard for the team, he's very disciplined and it takes him some time to maintain that intensity for 90 minutes.
"Don't forget as well I had Walcott, Giroud and Alexis on the bench, so after 65 minutes in a game of that intensity, it's normal that you bring some fresh legs in."