Ireland's Seán O'Brien has been suspended for one week after being cited for a punch on French lock Pascal Pape during Ireland’s 24-9 victory on Sunday.
O'Brien was handed a two-week ban, reduced to one week for a previously good discipline record.
The suspension rules O'Brien out of Sunday's quarter-final with Argentina, but he will be available for a possible semi-final, should Ireland progress.
A statement from World Rugby read: "O’Brien admitted committing an act of foul play and therefore the independent Judicial Officer Terry Willis (Australia) upheld the citing on the basis that the player had committed an act of foul play contrary to Law 10.4(a).
"Willis conducted a detailed review of all the available evidence, including all camera angles and additional evidence from the player and submissions from his legal representative.
"With respect to the sanction, the Judicial Officer deemed the act of foul play merited a low-end entry point of two weeks. The Judicial Officer considered that there were no aggravating factors. The Judicial Officer took into account compelling mitigating factors including O’Brien’s conduct prior to and at the hearing, his remorse, good character and clean disciplinary record, and reduced the suspension to a period of one week.
"In the context of the Rugby World Cup tournament a week equates to one match. The suspension takes effect immediately, therefore O’Brien is suspended for Ireland’s quarter-final match against Argentina on Sunday, 18 October, 2015. He is free to resume playing on 19 October, 2015."
In better news for the Ireland camp Argentina centre Marcelo Bosch will also miss the clash in Cardiff. He was banned for a week after being cited for a dangerous tackle against Namibia last Sunday.
O'Brien struck Pape in the stomach early in the match in Cardiff but escaped punishment from referee Nigel Owen at the time.
France coach Philippe Saint-Andre branded O'Brien's clash with Pape an "assault", but Ireland's Joe Schmidt claimed his back-rower had connected with an "open hand".
O'Brien's ban brought to a close a day of high emotion for Ireland that started with a string of tributes to long-serving skipper Paul O'Connell.
Ireland confirmed on Tuesday morning that O'Connell needs surgery on his torn hamstring, leaving the 35-year-old unable to add to his 108 caps.
Peter O'Mahony flew home to Cork on Monday after suffering serious knee ligament damage against France, leaving Ireland requiring several shifts in their pack.
Rhys Ruddock arrived to replace O'Mahony while Mike McCarthy was drafted in to offset O'Connell's absence.
Ulster flanker Henry has insisted Ireland can cope without twin enforcers O'Connell and O'Mahony against Argentina in Sunday's last-eight clash.
Ireland bosses were still holding out hope that linchpin fly-half Johnny Sexton could beat his groin trouble in time to feature against Argentina, keen not to see their ranks any further depleted.
