The Athlone has played in two of Ireland's three World Cup matches so far.
Ireland forwards coach Paul O'Connell has revealed that Robbie Henshaw has picked up a "niggle".
The centre sustained the injury in training and it is being 'investigated' by the squad's medical team.
It leaves the player in doubt for the final Pool B match at the Rugby World Cup.
Ireland take on Scotland as they look to ensure qualification for the quarter-finals.
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