The French forward, now with New York Red Bulls, says he is saddened to hear the criticism of Wenger from fans and pundits this season as Arsenal have struggled to keep pace with the title-chasing Manchester clubs.
He said: "When you don't win people are always going to question your work, your legacy and what you did before. It is sad somehow but that is the way the game is. What are you going to do?
"For me, it is difficult to hear, difficult to see, but for me the boss will always be Arsene - always great for me and I know what he has done for the club."