The French midfielder has made only one Premier League appearance for the Gunners this season but is still a key part of the squad according to his close friend Ozil.
"I have a really good understanding with Mathieu," the German told Arsenal Player.
"He's a guy who always gives 100 per cent on the pitch but when he's off the pitch, he's a player who makes a lot of jokes and gets on well with a lot of his team-mates.
"He's just a great guy with whom I have a lot of fun.
"As I said, we're just pleased to have him in this team."