Sir Alex Ferguson believes fans have every right to protest against the Glazers but insists he has no problems with Manchester United's owners.
After recent announcements about the club's increasing debt, a number of supporters have been protesting against the Glazer family's ownership of the club once more.
However, while Ferguson believes they have every right to voice their concerns, he insists there has never been a problem with the owners regarding the transfer market.
"I'm never against protest," he told the Observer. "It's everyone's right, there's no doubt about that, but my problem with it, being manager of Manchester United, is that I've got owners who have never caused me any bother. Any time I've asked for money, they have given it to us."
Some have suggested that the debt may have influenced the decision to sell Cristiano Ronaldo to Real Madrid last summer, but Ferguson has reiterated that the £80 million move came purely because of the player's desire to move on.
"The only reason he was sold was because the boy fervently wanted to leave," he said. "I got a text from him last week saying, 'I miss you so much'. I'd texted him to say happy birthday - he was 24 - and he said he missed me, and 'Thanks for all the kind things you're saying about me'. You appreciate things like that."
Some believe that Wayne Rooney has found his best form this season as a result of Ronaldo's sale, and Ferguson is delighted with the striker's recent performances.
"What we're seeing now is a terror of a player," he said. "What he's got that he can't lose is an in-built hunger, in-built energy, in-built desire. Some people are born with these things."