Erik ten Hag said his Manchester United side fell well short of his expectations in their limp Europa League exit to Sevilla.
United were humbled 3-0 in Andalusia to crash out of the competition despite having held a two-goal lead in the final stages of the first leg before capitulating.
Today's FA Cup semi-final against Brighton at Wembley offers a chance for immediate redemption for a team who have seen their hopes of landing a cup treble dashed following elimination in Europe.
The match against Roberto de Zerbi’s high-flying side comes off the back of inconsistent form as cracks have begun to show in the manager’s rebuilding job at the club, with defeat in Seville coming in the aftermath of a loss to fellow Champions League chasers Newcastle and a 7-0 thrashing at Liverpool.
Ten Hag was asked whether the famous hairdryer treatment meted out by his predecessor Alex Ferguson was the kind of response he subjected his players to in the immediate aftermath of Seville.
"Sometimes, yeah, I can go strong in certain situations," he said. "It’s about timing, when to use it. As a coach, the communication style…you can pick many styles and this is one of them.
"(On Thursday), I was really mad. For me it was so unacceptable. You can make a mistake, but you have to carry on.
"If you play a quarter-final of the Europa League, you give everything. And we didn’t. For any team that is unacceptable. As a manager I can’t accept that my team is not giving its best.
"Yes of course (the players were made aware). I made them aware of my analysis, my feelings about the game were, what my facts of the game were. They didn’t match the standards (to which) I manage a team in professional football."
United’s season – and the Dutchman’s reign at Old Trafford – began with a 2-1 home loss to Brighton on the opening day of the Premier League season, the first of two humbling defeats in his first two games in charge.
It was followed by a 4-0 defeat away to Brentford, when United conceded all four goals inside the first 35 minutes.
Since then, the manager has been hailed for nurturing the first shoots of recovery for the club after years spent limping from crisis to crisis in the seasons since Ferguson retired.
"I hope that everyone sees, the experts and fans, that we have made progress"
Ten Hag acknowledged the latest setback, and insisted that the key to sustained success lies in grinding out results even when the team are not in top form, which was a staple of the success the club enjoyed under its most celebrated manager.
He added: "I hope that everyone sees, the experts and fans, that we have made progress (from the Brighton game), that we have developed. We are a different team now.
"We know and we have to face that we have steps to go. It’s quite clear. We spoke after Seville that it’s quite clear but also some other games.
"None of the team will always play the highest level, I know. But if you don’t play at the highest level, you still have to win.
"That is what we have to learn. How we deal with the setbacks in a game. We have to carry on, we have to stick to the plan, we have to stick to the game. You have to keep the confidence. So yeah, we have steps to go."
Brighton boss De Zerbi is giving Republic of Ireland striker Evan Ferguson every chance of proving his fitness ahead of Sunday's FA Cup semi-final against Manchester United at Wembley.
Albion are bidding to reach the final of the competition for only a second time in their history following a 4-0 replay defeat to United 40 years ago, but whether in-form Ferguson appears remains touch and go.
The 18-year-old has scored four Premier League goals this term and fired home a brace in the quarter-final demolition of Grimsby, but along with defender Joel Veltman, limped out of last weekend's 2-1 win at Chelsea with an ankle injury.
