Ireland captain Johnny Sexton has been ruled out for up to six weeks after suffering a twisted ankle and knee in the famous 29-20 victory over New Zealand on Saturday.

The Leinster fly-half will miss the final match of the Autumn Nations Series campaign against Argentina on Sunday and faces at least four weeks on the sidelines.

Joey Carbery came on to replace Sexton with 15 minutes to go at the Aviva Stadium and sent three penalties sailing through the posts to consign the All Blacks to defeat.

Sexton will remain with squad, while Connacht number 10 Jack Carty has been called up in the absence of the skipper.

Andy Farrell will also be able to call upon Munster back rower Gavin Coombes against the Pumas after he recovered from illness.

Ireland beat Argentina 28-17 when the two nations last met in Dublin three years ago.

Johnny Sexton says Ireland are "on a journey" and praised the team's character to bounce back from consecutive Six Nations defeats to hammer Italy in Rome.

Andy Farrell's side had started the tournament with defeats to Wales and France, the first by five points and the second by only two.

Ireland outclassed a poor Italy side on Saturday, though, with the Azzurri now having lost 30 straight Six Nations matches following the 48-10 reverse – the longest losing streak in the competition's history. 

The visitors ran in six tries while Sexton, returning to the side from a head injury, was eight from eight from the tee. That represents the most by any Ireland player while maintaining a 100 per cent success rate from the tee since Paddy Jackson kicked nine of nine against Italy in 2017.

With games against Scotland and England to come, Sexton is keen to ensure Ireland build on a promising display.

"We need to keep our performance levels like that against two very good sides," Sexton told ITV Sport after his 50th Six Nations appearance.

"Scotland have been very impressive in the first two rounds and if not for a red card would have been top of the table, probably. 

"This group is on a journey together, we're a year into it and we'd have liked to have had that performance earlier. 

"It's not for the want of trying, it's just little mix-ups along the way. Thankfully we put them right.

"We played very well, all of our forwards did – they've been very impressive over the first two rounds. 

"We've felt as a team that us backs have let them down at times. We improved on a lot of those areas today and thankfully got the victory we were desperate for. 

"We spoke about how close we were in the first two – both very different games but just very proud of the boys, the way we bounced back, it's a real sign of character when things have been going the way they have in the last few weeks, just to stick together and to show the work we've been doing behind the scenes."

Ireland have now won 21 of their 22 games against Italy in the Six Nations, while the 38-point margin of victory was their biggest in any Test match since beating the same opposition 63-10 in February 2017.

Ireland kick-started their Six Nations campaign as they beat Italy for an eighth successive time in the competition, claiming a 48-10 bonus-point victory in Rome.

Having gone down to Wales and France in their opening matches – the first time Ireland had lost their first two games of a Six Nations campaign – Andy Farrell's men got their first win of the 2021 campaign on Saturday.

The returning Johnny Sexton was typically influential, on point with his kicking and integral to slick attacks as Ireland made it 21 wins from their last 22 Six Nations meetings with Italy.

Garry Ringrose, Hugo Keenan and Will Connors propelled Ireland to a 27-point haul in the first half, Ireland's best first-half total in a Test since February 2018, with CJ Stander and Keith Earls also getting in on the act to seal a routine triumph.

Welcomed back into Ireland's line-up after missing the defeat to France due to a head injury, Sexton marked his 50th Six Nations appearance with a simple three-pointer five minutes in, moments after Paolo Garbisi nosed Italy ahead.

Sexton was adding two more points to his tally five minutes later, with Ringrose having picked a gap in Italy's defence to score the game's first try.

Another Sexton penalty edged Ireland further in front and despite some spirited Italy attacking, the visitors struck again as Ringrose turned provider for Keenan.

Ireland had a third try before half-time, Sexton combining with Jordan Larmour to feed Connors in the corner, though Italy managed to strike back through Johan Meyer.

Yet Italy's work was undone by sloppy defending immediately after the restart – Stander bundling his way over.

Italy's issues were compounded before the hour, substitute Giosue Zilocchi sent to the bin for an attempted ball steal.

Ireland appeared to have made their advantage count when Stander found the line again, only for the try to be disallowed for a knock-on.

Luca Bigi's booking handed Ireland a further boost, though, and Connors hauled himself over from a maul before Earls piled further misery on sorry Italy.

Perfect comeback for Sexton

Since his Six Nations debut, Sexton has missed just seven of a possible 57 matches in the championship, including Ireland's defeat to Italy in 2013.

Sexton successfully converted all eight of his kicks on Saturday, tallying up 18 points in total to give him a pristine record. The pace of the game was ideal for the 35-year-old, who also made eight tackles and 20 passes – the last of which played in Earls late on.

More misery for whipping boys Italy

Italy's losing run in the Six Nations now sits at 30 games, the longest of any side in the competition's history. Their last win at home was back in 2013, against Ireland (22-15).

They have now conceded a try-scoring bonus point in 18 of their 22 matches since such add-ons were introduced to the Six Nations in 2017.

What's next?

Italy welcome Wales to the Stadio Olimpico on March 13, with Ireland facing Scotland in Edinburgh a day later.