Johnny Sexton might face a race to be fit in time to feature in the Six Nations after it was confirmed he will undergo surgery on a facial injury.
The captain, who has played for his country 109 times, is set to retire after the World Cup in France later this year.
That means the upcoming Six Nations campaign, which Ireland start with a trip to face Wales on February 4, will be his last.
However, the 37-year-old fly-half's participation is in doubt after he suffered a cheekbone injury during Leinster's United Rugby Championship clash with Connacht on Sunday.
Leinster confirmed Sexton was due to have a procedure on Tuesday and will be assessed further following the operation.
Ireland are top of the world rankings and finished second in last year's Six Nations, four points behind champions France.
After facing Wales, they take on France in Dublin before travelling to Italy on February 25.
Andy Farrell's team play Scotland on March 12 and round off their Six Nations campaign against England six days later.
Scotland and Exeter full-back Hogg to retire after Rugby World Cup
Scotland and Exeter full-back Stuart Hogg has announced he intends to retire after this year's Rugby World Cup.
The 30-year-old this month became only the fourth player to reach a century of appearances for Scotland after Ross Ford, Chris Paterson and Sean Lamont.
But Hogg, who also leads the way for the most tries scored by a Scotland player (27), will hang up his boots after competing in France later this year.
"After RWC2023, my professional rugby journey will end and I will be retiring from the game," Hogg said in a statement posted on his personal Instagram account.
"As a young kid growing up in The Borders, all I wanted to do was to play rugby for Scotland.
"I feel privileged to have represented my country on 100 occasions, play on 3 British & Irish Lions tours and represent some amazing clubs. I couldn't have asked for any more.
"Rugby has allowed me to meet some incredible characters, make lifelong friends, travel the world and be part of some unbelievable experiences that I will cherish forever."
As well as representing Scotland since 2012 and featuring on three British and Irish Lions tours, Hogg also spent nearly a decade with Glasgow Warriors before joining Exeter.
Explaining the reason behind his shock retirement call, Hogg's statement added: "I don't feel my body can achieve the standards that I set myself for much longer.
"I've always wanted to finish at the top end of the game. A new career beckons and I will attack it in the same manner as I play the game. I hope I have done you proud."
Hogg signed off his statement with the words "100 not out (just yet)" in reference to the caps milestone he recently reached with Scotland.
He won the European Champions Cup and Premiership with Exeter in the 2019-20 season, following Pro12 success with Glasgow in 2014-15.
The Melrose native was also named Six Nations Player of the Tournament in 2016 and 2017.
Should he be selected as expected, Hogg will feature in his third World Cup, having played eight times across the past two tournaments.
WRU governance to be 'improved irrevocably' after membership votes for change
Welsh Rugby Union (WRU) members have voted overwhelmingly in favour of structural change to the governing body.
An extraordinary general meeting was called by the WRU on Sunday, with 282 clubs eligible to vote on proposals to reform how rugby union is run in Wales.
The EGM came after Wales players had threatened to strike ahead of their Six Nations match with England due to contractual disputes, while the organisation has also faced allegations of sexism and misogyny.
Those allegations resulted in the resignation of former chief executive Steve Phillips, with Nigel Walker stepping in on an interim basis.
Of the 252 votes cast at Sunday's EGM, 245 were in favour of the resolution to change the governing structure of the WRU.
Controversial Steward red card overturned
England fullback Freddie Steward has been cleared to play for his country with immediate effect after the red card he received against Ireland was overturned.
Steward was dismissed in England's final Six Nations clash of this year's tournament as they lost 29-16 to Grand Slam winners Ireland at the Aviva Stadium on Saturday.
The 22-year-old received the contentious red near the end of the first half after his shoulder connected with the head of Hugo Keenan.
Steward appeared before an independent disciplinary committee via video link to protest his innocence.
The committee determined that head contact with an opposing player had occurred and believed it had been an act of foul play, adding Steward "had been reckless in his actions and in his upright positioning as he approached and came into highly dangerous contact with the other player".
However, it was also decided that "there were sufficient mitigating factors including the late change in the dynamics and positioning of the opposing player which should have resulted in the issue of a yellow card rather than a red card".
The decision means Steward will not face a ban and is free to play again immediately.
England captain Owen Farrell said after the game: "I was surprised [at the red card] if I am honest. But it is not up to us, we don't make the rules, we don't put them in place, we don't hear what goes on on the ref mic and the process that they go through.
"That is the decision they came to and you have to accept it."
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