Erik ten Hag has warned it will take "months" to consistently produce the intensity Manchester United need to become a force again.
There was an air of optimism at Old Trafford following four consecutive Premier League wins, but that came to a juddering halt when the Red Devils suffered a chastening 6-3 derby defeat at Manchester City last Sunday.
The champions tore United apart, Erling Haaland and Phil Foden scoring hat-tricks in a rout at the Etihad Stadium.
Ten Hag's side came from behind to win 3-2 at Omonia Nicosia in the Europa League on Thursday and return to top-flight action with a trip to Everton on Sunday.
Dutchman Ten Hag, who left Ajax to take the United hot seat at the end of last season, says it will take time for his side to reach the sort of levels he expects.
"It's more - it's physical, it's mental, it's also sustainability," he said.
"It's like a routine, a way of life and you have to bring it to every training in your system, as a squad and an individual player.
"When you have had a lack of it in the last years, it's not something that you build or progress in a week or a month.
"Now it's a system that has to be [in place]. It is a demand nowadays top football and it's quite clear City is the standard in that. There are more teams, but I think we can deliver that.
"We have seen it against Liverpool and we have seen it against Arsenal, but now we have to do it on a consistent basis, that is what we have to work for now.
"It will not come overnight, it will also take more than weeks - it will take months."
Ten Hag also expects United to be more disciplined and streetwise.
He added: "I know nasty, I know what it is. In that manner we can progress but sometimes also play a little bit smarter.
"Like we have too many bookings and some players at the start of Premier League, they play tough.
"But I wonder [why] we collect so many bookings and I don't understand, like the first booking [for Diogo Dalot at City] on Sunday, I really don't understand.
"We want to play tough, we want to keep the game going and then in the second minute already it's a booking for Diogo.
"Also, I saw many other bookings where I think, 'Is that necessary?' I have to keep the reminder to the players to play smart, but they have to play nasty as well."
Raphael Varane could return from an ankle injury at Goodison Park, but Harry Maguire remains sidelined along with Aaron Wan-Bissaka and Donny van de Beek.
'Legend' Van Nistelrooy departs Man Utd after Amorim arrival
Manchester United have confirmed Ruud van Nistelrooy has departed the club following Ruben Amorim's arrival at Old Trafford.
Van Nistelrooy returned to the club in July on a two-year contract as an assistant to Erik ten Hag.
He was placed in interim charge after Erik ten Hag's dismissal last month.
The 48-year-old oversaw four games during his temporary tenure, earning victories over Leicester City in the EFL Cup and PAOK in the Europa League. United were then held to a 1-1 draw by Chelsea, but Van Nistelrooy signed off in style with a 3-0 win over the Foxes in the Premier League on Sunday.
But Amorim, who began his new role on Monday, has decided against retaining the Dutchman's services, with the club saying the full men's first team coaching composition will be announced in due course.
"Ruud is and always will be a Manchester United legend," the club said in a statement.
"We are grateful for his contribution and the way in which he approached his role throughout his time with the club. He will always be very welcome at Old Trafford."
Assistant Rene Hake, goalkeeping coach Jelle ten Rouwelaar and analyst Pieter Morel have also left the club.
However, former United midfielder Darren Fletcher will remain in his coaching role and continue his link between the first team and the academy.
Pereira replaces Amorim as Sporting head coach
Sporting CP have confirmed Joao Pereira as the club's new head coach following Ruben Amorim's departure to Manchester United.
Pereira, who made 154 appearances across three different spells with Sporting, has put pen to paper on a deal that runs through until 2027 with the Primeira Liga champions.
The 40-year-old also appeared five times under Amorim during the 2020-21 season, a campaign that saw Sporting claim their first top-flight title in 19 years.
Pereira has previously managed Sporting's Under-23 side, taking charge of 53 games and winning 20 of those (D17 L16), averaging 1.45 points per match.
He most recently took charge of Sporting's B team, but oversaw just 11 matches, and he is relishing the opportunity of leading the club after the international break.
"As a player, Sporting gave me a lot, allowing me to play for the national team, join one of the best leagues in the world and return home twice," Pereira said.
"I only repaid them with a Super Cup and a national championship, which felt more like their gift to me.
"That’s something I regret, so as a coach I’d like to repay them with more titles because Sporting deserve it.
"If I had doubts and thought things might go wrong, I wouldn’t be here. It hasn’t even crossed my mind that it could go poorly.
"I know we’ll face challenges, but I believe it will go well."
But Pereira has a tough act to follow, with Amorim ending his glittering stint with the club on a high after a 4-2 win over Braga on Sunday.
Amorim won 164 of his 231 games in charge of Sporting, averaging a win percentage of 71%, which is a club record.
During his time in charge, only Manchester City (127) won more matches than his Sporting team (122) across Europe's top 10 leagues.
"Ruben leaves behind a legacy, and that legacy isn’t only in titles, victories, and records but also in the unity he built among the Sporting family," Pereira added.
"I know this brings great responsibility, but that responsibility comes hand-in-hand with a strong ambition and motivation to continue making Sporting a winning club with a bright future.”
Pereira's first assignment will come in the Taca de Portugal against fourth-tier side Amarante on November 22, before welcoming Arsenal to the Estadio Jose Alvalade in the Champions League five days later.
'I'm not naive', says Amorim as he relishes 'difficult' Man Utd challenge
Ruben Amorim insisted he was "not naive" about the "difficult" task awaiting him as Manchester United's new head coach.
Amorim took charge of his final game as Sporting CP's manager on Sunday, culminating in a 4-2 away win against Braga to maintain their perfect start to the Primeira Liga season.
The 39-year-old ended his glittering career with the Portuguese side having won 164 of his 231 games at the helm (D34 L33), bowing out with a win percentage of 71%, a club record.
Amorim arrives at Old Trafford after a string of impressive results under interim boss Ruud van Nistelrooy, who went unbeaten across his four games during his temporary stint.
Though the Portuguese's arrival at the club and the positive results of late have lifted the mood in Manchester, Amorim acknowledged the enormity of the task at hand.
"I feel ready for the new challenge," Amorim told reporters after his final match at Sporting. "I'm not naive, I know it's going to be very different, very difficult.
"I'm at peace now. I can focus on my new job, and I'm looking forward to starting tomorrow.
"I know it will be difficult to reproduce what I have here anywhere else, but there are other places with different exposure and pressure."
United are yet to confirm the precise nature of Amorim's backroom team and whether Van Nistelrooy will remain at Old Trafford.
The Dutchman returned to Old Trafford in July as an assistant coach under former boss Erik ten Hag, signing a two-year contract.
"I have to talk with him [on Monday]," Amorim added. "I will explain everything. I'm very clear, and I will tell you like it is. So let's wait."
Amorim now has 13 days during the international break to prepare for his match in charge, which comes at Portman Road against Ipswich Town on November 24.
His first Old Trafford outing comes four days later in the Europa League against Norwegian champions Bodo/Glimt.
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