( CNN ) -- Manchester United manager Alex Ferguson has defended the club 's American owners telling CNN he has `` no complaints '' with the way they have done their job . The 18-time English league champions were bought by the Glazer family in 2005 but have long been targeted by the club 's supporters for running up huge debts . Though United have recently been rated as the world 's most valuable sporting club by Forbes they still have estimated debts of over $ 1bn , leading many fans to call for a change of ownership . A group of wealthy businessmen called the Red Knights tried to launch a takeover bid last season but were knocked back , and now Ferguson has insisted the current owners are doing a good job . Is this the real Alex Ferguson ? He told CNN : `` The debt has come through by the club being bought out by an owner . You know fine well that when a business is bought it 's usually bought with debt . `` Because it 's a football club it seems to attract a different type of negative reporting via the media and , particularly some of our fans . `` But Manchester United football club , when it went plc , it was always going to be bought . It was inevitable . So when a particular family like the Glazers have bought it , it 's unfair they come in for criticism because anybody could have bought it . `` I have to say they 've done their job well . They support myself , the manager , they 've supported the players . I 've never been refused when I 've asked for money for a player . `` So what can I do other than carry on the way we 're doing it and the way I 'm allowed to carry on , I 've no complaints . '' Ferguson is about to enter his 24th season as manager of one of the world 's most high profile clubs . In that time he has won 11 English league titles and two European Cups . Speaking to CNN World Sport anchor Terry Baddoo on the club 's pre-season tour of the United States , 68-year-old Ferguson reiterated his desire to continue as manager as long as he retains his health . He said : `` I 'm at the right club , it 's a fantastic club , it demands a challenge all the time . Every day , every year there 's the challenge of being at the top and that helps me . I think you need good natural energy and I 've been blessed with that . `` What you have to do is maintain the success of the club and make sure no matter when I quit the club is always in good hands and that 's when I come back to the point about having young players . `` There 's no need for a complete overhaul of the playing squad . I 've got 12 players aged 21 or under which means the future should be pretty secure with them . `` Whenever I do go , and I do n't seeing that being tomorrow , having my health is important . If I 've got my health I can carry on . There will be a point when I do quit but when it is I 've absolutely no idea . `` I tried it a few years ago and it was an absolute disaster . My wife made me change my mind and she was dead right . But when the time comes , I think the club should be ok . ''
Alex Ferguson tells CNN he has `` no complaints '' with Alex Ferguson owners the Manchester United family . Glazers bought CNN World Sport in pre-season but debts now stand at around $ 1bn . Ferguson says he will continue as Manchester United manager as long as he is healthy . United boss spoke to CNN on club 's pre-season tour of the U.S .