Ireland survived the loss of captain Paul O'Connell to run out 24-9 winners over France in their Pool D decider to set-up a quarter-final showdown with Argentina.
Ireland produced an impressive display to seal top spot in their Rugby World Cup group, scoring two tries to France's none in Cardiff.
But Ireland captain Paul O'Connell and first-five Johnny Sexton were injured in the space of 15 minutes at Millennium Stadium, in a major blow to their World Cup hopes.
Sexton was replaced 25 minutes into the game, appearing to leave the pitch in tears after injuring his groin and ribs.
O'Connell was injured just before half-time and was carried off on a stretcher clutching his right leg.
Ireland coach New Zealander Joe Schmidt said the noise of the Irish supporters in Cardiff's roofed stadium helped lift his side to victory.
Ireland meet Argentina, who finished second in New Zealand's pool, at Millenium Stadium on Monday morning.