The on-loan New York Red Bulls striker has been a big influence on the young players at the club, says Wenger.
"Only positive. How much, you can never give a percentage, but he was very positive and everyone takes his advice on board because he has delivered here and they want to deliver too. He is respected and he was very positive. He is not going away yet, normally he stays until after the Milan game. So we go to Sunderland now and then we go to Milan - that is two massive games."