Former Manchester United boss David Moyes has claimed the club has abandoned tradition in the wake of Sir Alex Ferguson's departure.
Moyes, who replaced his compatriot at the Old Trafford helm in May 2013, has since been succeeded by Louis van Gaal and Jose Mourinho, while United have invested heavily in the transfer market in a bid to rekindle Ferguson's trophy-laden reign.
The Sunderland manager said:
Manchester United was a club with great traditions that they tended to pick British managers. That tradition has now gone.
They are a football club who had traditions with the way they spent - they didn't try to compete with all the others clubs, they tried to do what they thought was the right thing to do and spend in the right way.
I could say that's gone, so I think there have been a few changes at United, but that's the way they have chosen to go.
David Moyes has called for a united front as he attempts to drag Sunderland out of another tailspin, warning that sacking managers in the past has not solved the club's lingering problems.
The 53-year-old Scot is still awaiting his first Premier League win as Black Cats boss nine games into his reign and finds himself rooted to the foot of the table, as have so many of his predecessors in recent years.
However, he believes the departures of Roy Keane, Ricky Sbragia, Steve Bruce, Martin O'Neill, Paolo Di Canio, Gus Poyet, Dick Advocaat and Sam Allardyce inside the last eight years illustrates that there is something more fundamental than simply the performance of the man in the hot-seat in Sunderland's failings.
Asked how difficult he is finding the current situation, Moyes said:
Yes, it is, it's never easy. But I've got to say, it's part of the job and I don't think when I came here I probably expected it to be an awful lot better.
I hoped it would be better, but I think deep down, I also expected it to be that way. But you know, it's a collective job now, it's not just the manager because everybody has had the focus on the manager here before.
It has to be the staff, it has to be the playing staff, it has to be everybody involved in the club because yes, you can change the one guy there, but it's proved in the past that's not the answer.
Sunderland boss David Moyes is "not impressed" after defender Patrick van Aanholt was photographed apparently smoking a shisha pipe.
The 26-year-old Dutchman woke on Friday morning to see the pictures in a national newspaper just days after he was withdrawn from the team to face Tottenham because of a heart scare.
Moyes was less than impressed and has spoken to the player about his off-the-field activities, and while the incident took place during the closed-season, he is not expecting a repeat.
The Scot said: "I don't expect a player to do that, I don't expect a player playing for me to do that. I have had a word with him. I am not impressed.
"But I have got to also say it's a picture that comes out maybe six weeks ago, it was in his off-time, it wasn't during the season.
"But just let me make sure, in no way do I condone it at all. I think it's a bad thing for us to show our younger children and for supporters who follow the players. I don't think it's a good thing, I don't think it's a good thing at all."
David Moyes has called for managers to be given time to implement their plans as he plots the way forward at Sunderland.
Moyes welcomes former club Everton to the Stadium of Light in Monday night's Premier League fixture and the 53-year-old Scot spent 11 years at Goodison Park, where he established the Toffees in the top half of the table and took them into Europe despite working to relatively modest budgets.
Since leaving Everton, Moyes lasted less than a year as Manchester United manager before a 364-day spell in Spain as Real Sociedad boss.
And as he embarks upon his latest mission on Wearside, he insists it is no coincidence that managers who get the time to bring their plans to fruition enjoy the most success.
Moyes said: "You know, if you look at the clubs which really had good success, Brian Clough was at Nottingham Forest, I think, for 18 years; Sir Bobby Robson was at Ipswich Town for, I think, 13 years; Sir Alex Ferguson, you look at Arsene Wenger and then myself.
"If you look at the length of period that managers were there, you would say the clubs which have kept their manager for a long period have tended to get a level of success.
"They could be different eras, but because of media, because of a different type of pressure which comes under the owners or different owners I could say as well, it's not been quite so good.
"I was really fortune that I worked under two great people in Sir Philip Carter and Bill Kenwright (at Everton). There were mistakes along the way, of course there were, and there were disappointments along the way, but they always saw the bigger picture and always had an idea where we were going."
David Moyes has refused to rule out Jermain Defoe edging his way into Sam Allardyce's first squad as England managerRead the full story ›
David Moyes is relishing the chance to succeed new England manager Sam Allardyce at Sunderland and return to the Premier League.
Allardyce was confirmed as Roy Hodgson's successor with the national team on Friday, leaving a Premier League vacancy at the Stadium of Light.
A statement published on Sunderland's official website on Saturday morning revealed former Manchester United manager Moyes, 53, has arrived on Wearside on a four-year contract.
Moyes said on www.safc.com:
I am delighted to have joined Sunderland. I am relishing the challenge and excited by the opportunity.
I have taken over a big British club with a great support and I'm looking forward to working in the Premier League again. I look forward to continuing the good work done by Sam.
David Moyes is eyeing another opportunity in Europe after his dismissal from Real Sociedad in NovemberRead the full story ›
Real Sociedad have parted company with manager David Moyes after less than a year in charge at the Anoeta.Read the full story ›
Real Sociedad have quashed speculation that David Moyes will leave the club this summer and return to coaching in England.Read the full story ›
Former Man United and Everton manager David Moyes believes we may just be witnessing the worst Premier League ever.
The Scottish manager took over at Real Sociedad in the summer after a disappointing spell at Man United was brought to a premature end by the club's directors after nine months.
Speaking to BT Sport, the 51 year-old said:
From my opinion, I think it's as poor a Premier League as I've seen, maybe since the start of the Premier League.
When you think of the great players who have graced the Premier League and the teams, I look at this year and I don't see that. I see good teams, very good teams and some great players, but I just don't see the competition the way it was in years gone by.