The Arsenal manager is "not deeply concerned" by photos of the midfielder says that he will speak to the England star about the incident to find out exactly what happened
The 22-year-old was photographed smoking a cigarette while on holiday in Las Vegas earlier in July, behaviour for which he had already been criticised by the Arsenal manager for a similar incident last season.
Wilshere has returned to pre-season training following England'’s World Cup campaign but did not feature in the Gunners' 2-0 win over Boreham Wood on Saturday afternoon.
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"I know what you can make of pictures. I have to speak to him to see what really happened before coming out publicly.
"I'm not deeply concerned by it but I just want to know what happened but, before I know what happened, I don't want to talk too much about it."
When asked how important the new season is to Wilshere's development, Wenger replied: "Well, he's at an age where you want him to [move] forward. He has the potential.
"I believe for him the most important now is to have a good preparation. Focus on getting really fit.
"Jack is a great player, he has a football brain, he is ambitious. I'm sure, injury-free, he can have a great season."