Cole Palmer’s four-goal haul in Chelsea’s thumping 6-0 win over Everton at Stamford Bridge was overshadowed by what Mauricio Pochettino called “unacceptable” behaviour as two of his players were involved in a physical altercation over who should take a penalty.

The home side was four goals up in the second half when Nicolas Jackson and Noni Madueke caused the unsavoury scene that left their manager feeling the need to apologise to fans watching the game around the world.

Palmer, the club’s appointed penalty taker, finally took charge following intervention from the captain Conor Gallagher, recovering his composure to score his fourth of the game and move on to 20 Premier League goals for the season.

“The players know, the club knows that Palmer is the penalty-taker,” said Pochettino, who was visibly agitated during his post-match duties.

“I’m so, so upset about the situation. In every country people are watching the game and we cannot send this type of image.

“I want to apologise to our fans. Discipline is the most important thing for the team. It’s a collective sport. I’m not going to accept this type of behaviour. I’m going to be very strong. I promise it’s not going to happen again.

“We need to move on and talk about the game – 6-0 against a very good team like Everton, clean sheet, I think we should be happy, no?”

In a debut season defined by individual excellence, the first half was superb, even by Palmer’s own exceptional standards.

His first goal alone was worthy of winning a Premier League match, nutmegging Jarrad Branthwaite before playing a neat one-two with Jackson, then curling the ball left-footed beyond the dive of Jordan Pickford.

His second was a poacher’s finish, reacting quickest to knock in the rebound after Jackson’s effort had been pushed out by the goalkeeper.

Everton were falling apart, a collapse encapsulated by Pickford’s error, playing the ball straight to Palmer to punt the ball into an empty net from 45 yards.

Jackson scored Chelsea’s fourth, hooking Marc Cucurella’s cross under control and guiding it home with a swing of the right boot.

Then came the sight of Jackson and Madueke pushing and shoving over a penalty awarded in the 63rd minute.

“We don’t talk about punishment,” said Pochettino. “It’s about learning. They are young guys. It was very good the reaction of Gallagher like a captain. But you cannot show that type of behaviour.

“The discipline is going to be stronger. If they behave like kids, it’s impossible. You cannot behave like kids. It’s a shame, it’s an unacceptable thing. We don’t deserve to be talking about this.”

At the end of an excellent display, academy graduate Alfie Gilchrist capped things off by firing home his first goal for the club in stoppage time.

Everton boss Sean Dyche, whose side sit just two points clear of the relegation zone, reflected on a “horrid” night for his team.

“It’s miles off where we want to be,” he said. “There’s no excuses for that. Miles off the mark, miles from where we’ve been.

“The goals were alarmingly poor. It’s just simple tackling, reading and anticipating the game. The basics were out the window. A horrid night without a shadow of a doubt.”