Arsenal boss Arsene Wenger was happy to see his team keep a clean sheet against Sunderland on Saturday.
The Gunners' last clean sheet before the weekend was in September against Aston Villa and the Frenchman was delighted to leave the Stadium of Light with no conceded goals and all three points.
"If you're not capable of keeping clean sheets, you don't move forward because if you always have to score three goals to win a game, at some stage it doesn't work, so I'm happy," Wenger told Arsenal Player.
"[It was] very pleasing. [The team was] very focused, very united, very concentrated not to make mistakes.
"In the end we got a good win with a clean sheet on top. I'm very happy about that.
"It's our second away game in three days. Before the game, I would have signed for a 1-0 - it became a 2-0 very late in the game.
"I'm very happy. We dropped two points against Hull, so we could compensate and win today.
"It was very important for our morale and to come up the table again as well.
"He kept going, Alexis, he goes at you - he's not frightened to go forward.
"Sometimes you think his passing is not quick enough but he's very efficient and he really plays to win. He's a winner."