Leinster back-row forward Rhys Ruddock has been called up by Ireland following Peter O'Mahony's withdrawal through injury.
Ruddock will arrive in Cardiff on Monday to join up with the squad.
He will be in contention with Chris Henry and Jordi Murphy to start for Ireland's quarter-final against Argentina.
Futher updates on the fitness of Paul O'Connell (hamstring) and Johnny Sexton (groin) are expected shortly.
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