Arsenal boss Wenger: Koscielny at his best against Marseille
Koscielny has shouldered extra responsibility since the loss of Thomas Vermaelen to injury and his manager believes the 26-year-old is now playing with more authority.
"I believe he was certainly Man of the Match in that game," Wenger told Arsenal Player.
"You saw in that game what we want from Laurent - he was commanding and playing with authority. That is something that has come out of the game last night.