The Glazers bought bought United in 2005 for £800 million but the club's debt have reached an estimated £700 million, provoking an outcry by fans and resulting in the setting up of breakaway fans' club FC United of Manchester and the Green and Gold protest movement.
"They've done the job well. I've never been refused when I've asked for money for a player," said Ferguson. "What can I do other than carry on the way we're doing it and the way I'm allowed to - I've no complaints.
"The debt has come through by the club being bought out by an owner. You know full well that when a business is bought it's usually bought with debt. Because it's a football club it seems to attract more negative reporting from the media and from the fan 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."
The Red Knights consortium, a group of wealthy supporters led by Goldman Sachs chief economist Jim O’Neill and former Football League chairman Keith Harris of investment bank Seymour Pierce, considered making a takeover bid earlier this year but put plans on hold in June.
