He said: "We have to get behind him and support him because he is a tremendous force and (is of) tremendous importance for the team - you want your own fans to be behind him.
"What happened in the transfer period did not always reflect his deep desire and there was manipulation from agents on both sides, but overall I am positive he will recover."
Wenger added: "Every player needs to feel wanted.
"I think he is settled in his own mind. He has given a lot in the first two games."