James Ryan missed trials for the Lions South Africa Tour this summer and was told he may need to be called up after Captain Alun Wyn Jones dislocated his shoulder in Saturday's warm-up game against Japan.
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The Irish Rugby Football Union confirmed that James Ryan's adductors had been injured in the Irish locker.
This issue may explain why the 24-year-old did not join the British and Irish Lions this weekend to replace injured captain Alun Wyn Jones.
Ryan missed the first selection for the Lions' South Africa trip this summer. After Jones dislocated his shoulder during Saturday's warm-up game against Japan, he was told he might be called up.
In its place, Welshman Adam Beard was called in and Irish scrum-half Conor Murray took over as captain.
Ryan will remain with the Irish team to prepare for the summer test against Japan and the United States and will be evaluated in the coming week. He captains Coach Andy Farrell in the Dublin game on 3 and 10 July.
Uncapped Ulster back Michael Lowry will also continue to train with the team brought into the group last week.
“James Ryan has an adductor problem and will be checked in a week to determine if he has a chance to compete in Japan,” wrote a team update from IRFU.
“Michael Lowry from Ulster will continue to train with the Irish team this week.”
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