The Costa Rica international produced his best performance in an Arsenal shirt in the 3-0 Champions League win over former loan club Olympiacos on Wednesday night.
The highlight of his performance was his exquisite assist for Olivier Giroud's second goal of his hat-trick in what Wenger described was a fighting performance.
Wenger was full of praise for the 23-year-old after the win: "A former player for Olympiacos was firstly a former player of Arsenal.
"Joel Campbell is a very good player who has individual skill but what I also like is that he is a real team player who fights for the team.
"On top of that he will get to an age where he becomes a real professional footballer. He came from Costa Rica at a very young age, went to four different clubs on loan and that made him tough.
"Now he gets his chance and he is getting stronger in every game."