Chelsea striker Nicolas Jackson promised to work even harder after his hat-trick earned boss Mauricio Pochettino a statement victory at former club Tottenham.

Jackson’s second-half treble settled a pulsating London derby where five goals were disallowed and red cards were shown to Spurs pair Cristian Romero and Destiny Udogie either side of half-time.

While Chelsea were far from vintage on their way to a 4-1 victory, Jackson eventually made the difference.

The Senegal attacker side-footed home his first goal in the 75th minute from Raheem Sterling’s cross before he grabbed a similar second after Conor Gallagher’s pass and completed his treble in the seventh minute of stoppage time when he rounded Guglielmo Vicario.

After receiving more yellow cards (five) than goals (three) during the first three months of the campaign, the £31million summer signing from Villarreal was pleased to start to pay back his price tag on Monday night.

Jackson: “Yeah, very happy. It was a difficult time for everybody in the team, but now we are coming back slowly, slowly and I am very happy to score three goals.

“It has been very difficult (for me) but life is like this. Now my first hat-trick and I am very happy I did it in the biggest club in England and everywhere.

“Always need to improve, always need to work harder. We continue working and now this (hat-trick) is the past, so we forget about it and move forward.

“We were dreaming about this, playing big games and winning big games. Now we continue to work hard and the confidence is coming slowly, slowly.”

Chelsea’s youthful side had struggled for consistency during the early months of Pochettino’s tenure, with battling draws against Liverpool and Arsenal married with home defeats to Nottingham Forest and Brentford.

Pochettino watched the Blues struggle to make their numerical advantage count against Tottenham until captain Reece James played through Sterling, who squared for Jackson to slide home with quarter of an hour left in N17.

Next up for the 10th-placed Blues is the visit of champions Manchester City on Sunday, which means a reunion for Cole Palmer against his old club.

Palmer, who took his Chelsea goal to three with the equaliser against Spurs, told Sky Sports: “This was a big game, we knew it was before we came into it. Big stadium and obviously they were unbeaten, but we thought we could come here and get a result and we did that.

View this post on Instagram

A post shared by Premier League (@premierleague)

“Obviously it is easier to play against nine men, but we knew we needed to win the game when they went down to 10 and then when they went down to nine especially.

“We knew we needed to score and if we kept pressing, making the runs in behind, because their line was so high, we would get in and we did eventually.

“It has obviously been a difficult start for Nico, no hiding from it, but he was brilliant.

“He just needs to work hard on the training pitch and keep his head down. Then I think he will get many more hat-tricks.”

Ange Postecoglou lamented that VAR has diminished the authority of referees after he watched nine-man Tottenham lose for the first time in the Premier League against Chelsea.

It was a frenetic meeting between the two rivals that saw five disallowed goals, two red cards, a penalty and two Spurs players forced off during the first half with injury, as Mauricio Pochettino marked his return to north London with a memorable 4-1 victory.

But the match was dominated by VAR’s involvement with the red cards two of nine decisions referred to the video referee.

Even with nine men the hosts continued to take the game to Chelsea and were well in the contest before Nicolas Jackson twice sprung their high line in stoppage time to add his team’s third and fourth goals and complete an unlikely hat-trick.

Postecoglou’s team had been comfortably on top in the first half before Cristian Romero’s red card in the 33rd minute, dismissed for a dangerous challenge on Enzo Fernandez and conceding the penalty from which Cole Palmer equalised Dejan Kulusevski’s deflected goal.

Destiny Udogie was also dismissed on 55 minutes, receiving a second yellow card for a foul on Raheem Sterling, but it took a further 20 minutes before Chelsea finally took the lead for the first time through Jackson.

Spurs’ night was compounded by the loss of James Maddison and Micky van de Ven to injury on top of what is likely to be a three-game ban for Romero.

But it was VAR’s impact that dominated Postecoglou’s thoughts after the game after a total of 21 minutes were added on at the end of each half.

“It’s hard to analyse from a football perspective,” he said.

“We’re left with a result which is disappointing, but super proud of the players’ efforts and will and desire to get something from the game.

“(Lengthy VAR pauses) are going to become the norm, I think it’s where the game is heading. Unfortunately it’s how we’re going to have to watch and participate in football from now on.

“I don’t like it. I don’t like the standing around, the whole theatre around waiting for decisions. But I know I’m in the wilderness on that.

“In my 26 years, I was always prepared to accept the referee’s decision, good, bad or otherwise, and I’ve had some shockers in my career. I’ve had some go my way as well.

“I’ll cop that because I just want the game to be played. But when we’re complaining about defections every week, this is what’s going to happen.

“People are going to forensically scrutinise everything to make sure they’re comfortable it’s right, and even at the end of that, we’re still not happy.

“It’s just diminishing the authority of the referee. You can’t tell me referees are in control of games. They’re not. Control is outside of that, but that’s where the game’s going. You have to accept it and try and deal with it.”

Pochettino reflected on a game in which, despite a host of contentious decisions, he felt his team were deserved victors.

“I think we deserved to win,” he said.

“We forced them to make too many mistakes. Tottenham were better in the first 15 minutes but then we matched the game. Our performance was good.

“Everything you can see during the game I think was fair. We compare to the Tottenham Liverpool game, a similar game like today. Liverpool complained. But today, everything that happened was fair. That’s why I think 4-1, the performance was good.”

Tottenham midfielder Rodrigo Bentancur has returned to full training but is still weeks away from being in contention to play first-team football.

Bentancur saw his fine 2022-23 campaign cut short in February when he suffered anterior cruciate ligament damage to his left knee during a 4-1 defeat to Leicester.

The ex-Juventus midfielder had been one of Spurs’ best performers, scoring six times in 26 appearances last season and after eight months out he is close to a return, but will not be in the squad for Monday’s visit of Fulham.

“No, he won’t be in the squad,” Tottenham boss Ange Postecoglou confirmed.

“We’ll be careful with him. Now he’s sort of fully training, so that means he’s into the whole session. We’ve drip-fed him into training the last month and he’s coped pretty well with that.

“Now he’s into full training. We’ve got to be mindful that he’s missed a fair bit of football, but I think the more he trains with the first team over the next few weeks, we’ll sort of pick our moment.

“He’s looking good at training and it was great to have him for the last couple of weeks fully integrated with the guys who are here and we’re looking forward to having him back.”

Joint-leaders Spurs will have vice-captain Cristian Romero and skipper Son Heung-min available for the London derby.

Romero suffered a whack to his ankle in Argentina’s 2-0 win over Peru earlier this week, while Son was visibly in discomfort during South Korea’s 6-0 victory against Vietnam, although did play the whole match and score in the friendly.

View this post on Instagram

A post shared by Son HeungMin(손흥민)?? (@hm_son7)

No issues have been reported since the duo returned to Hotspur Way this week.

Postecoglou added: “It has been a pretty positive international break. In terms of availability I’ll start with the internationals first and everybody is back.

“The medical reports seem good so no real issue around the guys from a fitness perspective.

“Playing on a Monday night helps and all the international players should be fine but Brennan (Johnson) we will need to see.”

Johnson has not played for Tottenham since the north London derby at Arsenal on September 24 after he sustained a minor hamstring strain.

The Wales international is training again and set to be in the squad against Fulham, but Spurs will be without Yves Bissouma after he was sent off for two bookable offences at Luton a fortnight ago.

Postecoglou also revealed Dejan Kulusevski is fine after speaking with the winger who was involved in Sweden’s Euro 2024 qualifier at Belgium on Monday, which was abandoned at half-time following confirmation that two Swedish supporters had been killed in a shooting three miles from the stadium in Brussels.

“No, he is fine. I had a chat with him,” Postecoglou explained.

“Like everyone else we shake our heads at these things where you go to a football game and these kind of things happen.

“It is sad and kind of confronting how close it comes to your own world, but Deki is fine. He trained yesterday with the team and is ready to go.”