The 25-year-old, who has recently recovered from an injury, made a substitute appearance in the 3-1 Europa League win over Koln last week.
"Jack has been consistent in training," Wenger said ahead of the game at Emirates Stadium.
"If you ask me is he back to his full, 100 per cent potential, I would say no, but he's not far away.
"The rest now can only be gained by competition.
"That's why I believe that these kind of games are very important for Jack at the moment.
"He is focused, he is working hard and he is absolutely determined to get his place back in the team.
"There is a big fight there and that's what we want."