Arsenal manager Arsene Wenger has said he has spoken with Jack Wilshere over a photograph that surfaced of the midfielder holding a shisha pipe, and that he knows he's "not a smoker".
The England international, who has not played since November due to injury, had been photographed smoking on two previous occasions.
"I have spoken with him about that -- he is not a smoker," Wenger told reporters the day before the north London derby against Tottenham Hotspur.
"He is sorry about what happened, but he has to master his own life.
"When he is here, he has to follow the rules. This photo has been taken at half past 12 after the Superbowl [at the weekend].
"I don't know what happened really. Away from the club, it is his responsibility to master his life.
"Today, everywhere you go people make photos, but one second of your life does not define who you are."
Wilshere responded to the photo by posting a video of himself on his Instagram account working hard in training.
He wrote: "Worry about your character not your reputation, because your character is who you are and your reputation is only what people who don't know you think about you."