He suffered a concussion in Friday's 42-12 win over Argentina.
Dan Sheehan has been ruled out of Ireland's November test with Fiji this Saturday.
The captain suffered concussion in Friday's 42-12 win over Argentina, and is now following return-to-play protocols.
Sean Jansen is also out for the rest of the Nations Championship - he came off with a knee injury on Friday.
Scrum coach John Fogarty says it's a shame to be losing the Connacht number-eight:
Leinster hooker Gus McCarthy and Ulster back-rower Dave McCann have been called up to the squad.

Monday's Main Lunchtime News
Monday Morning Sports Update
Rory McIlroy Finishes Third As Jon Rahm Claims Abu Dhabi Title After LIV Exit
Odegaard Fires Arsenal Past Hull City To Extend Premier League Lead
France Go Top As New Zealand And South Africa Claim Big Nations Championship Wins
Sunday Morning Sports Update
McIlroy To Compete For The Win In Final Round Of Abu Dhabi Championship Tomorrow
Manchester City Return To Top Of WSL As Chelsea Manage Draw At Everton