Wenger has already made it clear that he believes the 23-year-old has the ability to play as the main forward and was happy with his contribution to an important win at Upton Park.
"He is slowly getting there," he said. "You're confident now when he gets in front of goal that he will score. Of course he scored an important one today at a moment where the game was a bit 50-50.
"Theo has an outstanding attitude and I don't rule anybody out. If I did then I would not bring him on in a crucial moment in the game. I believe in him.
"Gervinho looked a bit tired and Theo made the difference. He scored the second goal and that is the most important one."