The 22-year-old has been affected by a series of leg injuries over the past four years, which has halted his progress for the Gunners and England.
However, Wenger now feels that the midfielder has returned to the form that makes him a difference maker for both club and country.
He told the club's official website: "He is back, physically, to where he was before. He has more experience and I think he mixed well his long balls and kept his individual capacity to make a difference [for England]. That is what being a midfielder is about.
"Jack is not a ball-winner. I believe he is more a guy you want to get close to the final third, [if you] keep him deep you take a big part of his efficiency away.
"He is a guy who likes to penetrate when there are many people - he can provoke free kicks, he can create openings. It would be detrimental to his strengths [to play in a position that] is not his strength."
Arsenal face Hull City in their Premier League clash later today.