Iain Henderson could miss Ireland's first autumn test against New Zealand next week in Chicago.
Henderson has been ruled out of this weekend's Guinness Pro12 clash with Munster after suffering a shoulder injury during the province’s Champions Cup win over Exeter last weekend.
Rodney Ah You will also miss the game, but in better news Darren Cave and Robbie Diack have been cleared to play.
However, 2016 Six Nations debutant for Ireland Stuart McCloskey remains on the list of injured players.
Ireland's opening test against the All-Blacks takes place on Saturday, November 5th.
The second test is on November 19th at Aviva Stadium.
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