Reported by the Sun few minutes ago MANCHESTER CITY defender Kolo Toure failed a drugs test after taking a diet pill belonging to his wife, according to Arsenal boss Arsene Wenger. Wenger has spoken with the former Gunners captain since news broke of his positive test for a specified substance. And the Frenchman confirmed what SunSport's Martin Blackburn told you this morning - that a diet pill was the reason behind Toure's failed test. Wenger said: "Kolo wants to control his weight a little bit because that's where he has some problems and he took the product off his wife." Wenger added: "Never trust your wife! That is how he was caught." Toure could face a lengthy ban and is currently suspended from playing for City. The 29-year-old moved to Eastlands in 2009 having spent seven seasons at Arsenal. Wenger spoke of his character in glowing terms and insisted Toure's error was failing to check the legality of the product he took. He added: "I think it is a mistake. Kolo was not cautious enough. I don't think there's a desire there to do something wrong and hide it. "It is a complete surprise because I had Kolo Toure here for years, I brought him here. "He is a boy who has a clean life. He's very honest living, always at home, a family man, and I don't suspect him at all to have taken drugs to enhance his performances. "I just think it is a mistake by forgetting to ask, 'Can I take that?'."