The 26-year-old's effort at Craven Cottage saw him continue an impressive start to the the season following goals against Aston Villa and Fenerbahce already this season.
"His second season is always better than his first one. You could see as well technically today that he was quite impressive," Wenger told the club's official website.
|14/1||Arsenal are 14/1 with BetVictor to win the Premier League
The Frenchman feels that six goals and two wins within a week have eased some of the pressure put on him to spend but insists that he still remains confident of adding to his squad before the north London derby against Tottenham next Sunday.
When asked whether he would buy before Arsenal's next game, he replied: "Before the Fenerbahce game? No. Before next weekend? It's possible.
"Honestly, I'm not the only one that can decide that because the clubs who sell the players [are involved too]. We are on the market, you know that. I know we expect news from us. We will try to give you some but, at the moment, nothing to announce."
The Gunners boss also confirmed that no new bid has been made for Newcastle midfielder Yohan Cabaye. "No," he replied when questioned on the matter.