Wenger has been impressed with the 23-year-old's rate of improvement throughout the campaign and believes his all-round game has prospered.
"It is what I expect of him," the Frenchman told Arsenal Player. "I believe that overall, Theo has improved offensively, defensively, with assists, in goalscoring and in teamwork.
"He is getting to where you want him to be now. I feel that he has made a step forward this season."