Peter O'Mahony's desperate try-saving tackle on Josh Furno spared Ireland's blushes in a 16-9 victory over Italy, as Joe Schmidt's men qualified for the World Cup quarter-finals.
Former Ireland flanker Kevin McLaughlin is the latest in a worrying trend of rugby stars forced to prematurely retire from the game due to concussion-related issues.
England will enter the World Cup armed with a confidence-enhancing 21-13 victory over Ireland but will know they should have emerged more convincing winners over the RBS 6 Nations champions in their final warm-up game.
Ireland will wheel out all available big guns for their final World Cup warm-up match against England at Twickenham on Saturday, except Cian Healy and Rob Kearney.
Wales flanker Dan Lydiate believes that Saturday's Dublin appointment with reigning RBS 6 Nations champions Ireland is "brilliant preparation" for the World Cup.
George North returns to rugby's international stage on Saturday with Wales coach Warren Gatland underlining that player welfare will always be paramount.