Carbery could get the nod with Sexton struggling to shake off thigh injury
Joey Carbery could start Ireland's World Cup clash with Japan in Shizuoka on Saturday should Joe Schmidt opt to take no risks with Johnny Sexton.
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British and Irish Lions fly-half Sexton did not train fully yesterday due to the thigh knock he sustained in Ireland's stunning 27-3 victory over Scotland in Yokohama on Sunday.
Skills coach Richie Murphy insisted it "wouldn't be unusual" for Sexton to sit out part of a session two days after a Test match, and Ireland expect him to join in full training tomorrow.
But even if the 34-year-old is available for Saturday's encounter, head coach Schmidt could opt to keep him under wraps. Fit-again Carbery needs rugby for match sharpness having missed the Scotland clash with the after-effects of his six-week knee injury.
"Johnny went through rehab today, but he had also done some work with the team - but he's being monitored," said Murphy.
"We expect him to train fully (tomorrow). That wouldn't be unusual for him not to train two days after a Test match.
"Johnny just got a bit of a bang on the leg (against Scotland). He just didn't feel comfortable to kick during the game so we have no problem passing over the duties."
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Carbery, Keith Earls and Rob Kearney are all fit again having missed the bonus-point Scotland win. Earls has recovered from his thigh issue and Kearney from his calf complaint so could slot into the line-up as Ireland will rotate resources, though cautiously given their wariness of facing the tournament hosts.
Conor Murray took over the kicking duties once Sexton had suffered the thigh niggle on Sunday, but Carbery would strike off the tee if paired up with his Munster half-back partner against Japan.
"Joey would be our more recognised goal-kicker so he would be next in line (behind Sexton)," said Murphy.
"We'd be happy with any of them but our three 10s are the guys who kick more for their provinces.
"They're the guys that are probably our frontline goal-kickers. Conor is a very accomplished kicker. He hasn't had to do it very often but he has a good process, he practises regularly and he's happy to take that responsibility, so we're happy to give it to him when that case arises."
On Carbery, Earls and Kearney, Murphy continued: "Joey is fine, Keith Earls trained fully today, and Rob Kearney fully trained. Those three guys from last week have made really good progress. Even by the end of last week they were ready to play.
Peter O'Mahony and Bundee Aki have passed all their head injury checks and returned to training yesterday, leaving the experienced duo available to face Japan.
Robbie Henshaw remains a long shot for the Japan game, however, as he continues to shake off a hamstring problem sustained in training.
"Pete and Bundee have come through well," said Murphy.
"Bundee and Pete both passed HIA three which means they are fit to return to training which they have done."