Chandler Cunningham-South is relishing every minute of the Six Nations maelstrom as he prepares to play a part in England’s daunting clash with back-to-back Grand Slam chasers Ireland at Twickenham on Saturday.

Cunningham-South’s gamble in leaving New Zealand, where he had lived since the age of four, to return to the UK two years ago has paid off handsomely with his ascendancy to the full England squad for the first time this year.

His debut off the bench in the opening win over Italy, and subsequent appearances against both Wales and Scotland, have appeared to make the Harlequins flanker an integral part of head coach Steve Borthwick’s long-term plans.

“It has been a really big step up for me and I think I have done all right,” said Cunningham-South. “I think I am the youngest in the squad and I have been taken under a few people’s wings.

“I like it. Especially when we were up in Edinburgh getting off the bus – all the heckling and yelling. That sort of stuff motivates me and gives me an extra bit of energy.

“Twickenham is awesome to play at. You don’t actually realise how big the stadium is until you are on the field looking up. It seems to not stop. It was awesome – so loud, so passionate, a real cool place to play.”

Cunningham-South, who was born in Sidcup, decided to head back over to England to pursue his rugby career after finding his opportunities limited in New Zealand.

But he admits he had big moments of doubt after arriving in the midst of the Covid pandemic and finding himself struck down with the illness more or less immediately.

“I got the opportunity over in England and it all happened pretty quickly,” he added. “It was a weird time because I was stuck inside for 18 days with Covid and I was like, ‘Did I make the right decision?’ But once I had got rid of the Covid and got into training I knew I had done.

“I suppose it’s not meant to be easy. Moving over at that age I was a little homesick at first, but when you are working hard and having fun with new friends it gets pushed to the back of your head and I have been loving every minute of it.”

Cunningham-South initially joined the London Irish academy in 2022, representing England in the under-20 Six Nations in the same year, before moving on to Harlequins when Irish folded due to financial issues.

His swift ascent up the England ranks was confirmed when he came off the bench in the narrow opening win over Italy and Cunningham-South believes he is beginning to reap the benefits of his big career decision.

“I needed to develop a lot and that’s why I wanted to be a part of an academy set-up,” he added.

“And there was a definite mindset switch – what it takes to be a professional is very different to when you are playing uni rugby. I didn’t realise how much detail goes into the professional game. It was a bit of a shock, but it’s been good.”

England rookie Chandler Cunningham-South was being mentored for weeks by Richard Hill without knowing he was talking to a World Cup winner.

Cunningham-South made a strong debut off the bench in Saturday’s 27-24 victory over Italy, becoming one of two flankers to win their first cap in the Guinness Six Nations opener alongside Ethan Roots.

As England team manger with the additional role of talent identification for the pathway, Hill has influenced the rise of both players as well as the likes of Sam Underhill and Tom Curry.

Hill’s keen eye for future Test stars is valued highly by head coach Steve Borthwick, who revealed when naming his Six Nations squad last month that “if Richard tells me to track a back-row forward, I’m listening”.

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Cunningham-South had Hill’s approval when on England Under-20 duty but presumed he was speaking to a random enthusiast rather than one of the country’s greatest flankers and a veteran of 71 Tests, including the triumphant 2003 World Cup final.

“There was no doubt that, as an 18-year-old, Chandler’s physicality of carry was not quite the norm for his age compared to others that I was watching,” said Hill, who was initially alerted to him by his first club London Irish.

“He was doing fantastically well so I made sure that I connected with him at the Under-20s training sessions.

“I carried on chatting to him and then after a number of meetings that I’d had with him, Jonathan Fisher, Irish’s academy coach, decided to ring me after a chance meeting.

“John said that Chandler has just told him how he turns out to Under-20s training and ‘a couple of times this guy’s come up to me and you know, he’s had a chat about my game’.

“’He seems to understand how to play and he’s got some reasonable ideas. You know, he sounds like he knows what he’s talking about’. So yeah, that was me!

“He found out probably three months ago that I played in the World Cup. Chandler’s not that fussed about what’s gone on in the past.

“He wanted to know why I didn’t tell him. I said it had no bearing on what we’re trying to achieve, which was him, not me.”

While Cunningham-South’s 14-minute cameo against Italy was rich with promise, Roots was close to the finished article in being named man of the match following a superb display at blindside flanker.

Borthwick first became aware of Roots when he was coaching Leicester against the Ospreys but it was when Hill showed him footage of the 26-year-old cage fighter playing for Exeter during last autumn’s World Cup that he really took notice.

Fast forward five months and the Chiefs forward is part of Borthwick’s England rebuild, providing vital carrying muscle to a side that is short on defence-busting power.

“If there is someone of interest for the future then I’d make Steve aware – and Ethan was one of those players,” Hill said.

“I knew he had a skill set that would interest us – he can carry the ball, carrying into contact, heavy contact, and defensively physical at the breakdown.

“He has been physical and consistent in terms of the performances he put in since joining Exeter this season.”

Roots is expected to continue in the number six jersey for Saturday’s visit of Wales to Twickenham, with Borthwick naming his team on Thursday afternoon.

England have revealed Marcus Smith could miss the entire Guinness Six Nations because of the calf injury that has ruled him of at least Saturday’s opener against Italy and Wales a week later.

A clearer picture over Smith’s fitness will emerge next week, but in the meantime veteran George Ford has been installed at fly-half for the Stadio Olimpico showdown with Fin Smith deputising from the bench.

Fin Smith is one of five uncapped players in the matchday 23 and should all of them get time on the field, it will be the highest number of new caps awarded in a single match since Stuart Lancaster’s first game in charge in 2012.

Centre Fraser Dingwall and flanker Ethan Roots are included in the starting XV while Smith, back row Chandler Cunningham-South and wing Immanuel Feyi-Waboso feature on the bench.

In a boost to England, Alex Mitchell has recovered from a leg wound to take his place at scrum-half, but the player who was expected to partner him at half-back faces an anxious wait to see if he will be involved at all over the coming weeks.

“Marcus will go back to England today (Thursday) and have further investigations later this week. He won’t be available next week,” Borthwick said.

“We’re not sure exactly when. Hopefully he will play in the latter part of the Six Nations, but it will be a number of weeks. We’ll know more next week.”

Mitchell’s immediate prospects of building on becoming first-choice scrum-half at the World Cup were thrown into doubt when he felt unwell as a result of the infected wound he took into England’s camp in Girona, preventing him from training fully until Thursday morning.

“Our medical team took great care of him over the weekend and at start of the week to get the infection under control and he looks brilliant,” Borthwick said.

“He played a lot of minutes for us during the World Cup and has played a lot of time for his club, so he is match sharp and ready to go. He looked fantastic in training today (Thursday).”

Experienced faces such as Ford, Joe Marler and Maro Itoje are present throughout the 23, but the rare inclusion of five debutants indicated the post-2023 World Cup rebuilding phase is under way, even if some of the picks were forced on Borthwick.

Dingwall starts at inside centre having been included in nine previous England squads without winning a cap, giving him the opportunity to prove he is the solution to the team’s problem position.

Although lacking the raw power of the injured Manu Tuilagi and Ollie Lawrence, the 24-year-old is a classy runner who is comfortable at 12 or 13.

Roots, a former jiu-jitsu champion who qualifies for England through his father, represented the Maori All Blacks but having left New Zealand in 2021 he has proved a hit at the Ospreys and now Exeter.

If Finn Smith, Cunningham-South and Immanuel Feyi-Waboso join them on the field, it will be an injection of fresh faces not seen for 12 years.

“Each one of those guys has earned his place in the matchday 23. Each one of them is an exciting young player,” Borthwick said.

“I didn’t think I’d be naming a 23 with five debutants. I’ve asked when the last time was England named a 23 with five new caps in it!”