David Gill, the Manchester United chief executive, has acknowledged he will always be unpopular with some supporters – the "anti-people", as he describes them – but he has spoken of his belief that the Glazer family have now won over the majority of the club's fans.

Gill, describing the Glazers as "genuinely long-term owners", reiterated the point by revealing that he and the American owners already have a strategy in place for when Sir Alex Ferguson retires. He said: "What we're trying to do is make sure we get the quality of team and the correct age profile so the new manager coming in, whoever that might be, has the nucleus of a world-class team."

Gill expects the Glazers to still be in control when Ferguson ends his long association with the club, but he was candid enough to accept that his comments would go down badly among the fans who were involved in the green-and-gold protest movement.

"We are never going to win [over] those people," he said. "If we won four European Cups in a row, there will be certain people who won't like the owners and what they stand for. The anti-people were here before the Glazers. But we are running the club for the vast majority of millions of fans around the world who believe the club is moving in the right direction.

"The minority – Must [Manchester United Supporters' Trust] etc – will always be against it, but the vast majority can't be dissatisfied with the seasons we've had [under the Glazers]."

The campaign against the Glazers has become less visible, in Gill's words, "once the Red Knights went away," referring to the consortium of businessmen who embarked on a failed bid to buy the club. "The green-and-gold campaign has not disappeared completely, but it has died down dramatically during the past season and we move on," he said.

Gill, speaking on the club's pre-season tour of the United States, dismissed the allegation that the Glazers, with an average net spend of £2.5m in their first six seasons, had not backed Ferguson sufficiently in the transfer market, citing the arrival of Ashley Young, David de Gea and Phil Jones for a combined £50m this summer. "One thing the owners have never shied away from is supporting Alex in terms of investment."

Similarly, he rejected the argument that the Florida-based businessmen had unfairly hiked ticket prices. "They are sensible prices to watch top-class entertainment and players worth millions on view. Other clubs have clearly raised their prices more than us," he said.

Gill has been singled out for particular criticism because of the way he fought against the Glazer takeover in 2005, once infamously saying that "debt was the road to ruin", before siding with the new owners and turning against the supporters' groups he had previously backed. "You say I did a volte-face, but we are going back many years now," he said. "Directors and chief executives aren't often liked, but I am trying to look after the employers and the fans, and there will always be an element among the fans who don't like you."

At times the anger has manifested itself in something more sinister, with graffiti appearing on his house and several incidents that have led to increased security. "It has calmed down now. It would be naive to say you don't want it to happen, not necessarily for yourself but because of your young children, but you just move on. I have never sought a profile; I just try to do my best for the club."

His son, Oliver, was booed when he was named as a substitute for one match, and has recently turned down the offer of a contract with the club to go to university. Gill, however, says it is unrelated. "He did take some stick, but he is quite a strong character. I don't think he ever thought like that."

Going into a season during which Ferguson will turn 70 and mark his 25th anniversary at the club, Gill talked about himself and the Glazers planning ahead to when the most successful manager in the business retires. "There won't be meltdown. It will clearly be a sea change for the club and we have to be ready."

He will be in charge of appointing the successor, although Ferguson will also be heavily involved. "I will co-ordinate the process, but, clearly, I will take great store in what he [Ferguson] says and what other key people at the club say. The owners will clearly have a view. All these things will come together. It would be a collective body, not a big body, but we would get all the input to make sure we make the appropriate choice."

There was no one in mind yet, he added, and he was unclear when Ferguson would stand down. "We never discuss it, put it that way. He delegates well and football keeps him young."