Ireland’s Sean O’Brien suspended for week and misses quarter-final

• Flanker receives one-week suspension after admitting punching Pascal Papé• Jonathan Sexton doubtful for World Cup quarter-final with adductor strainIreland, a country yet to make a World Cup semi-final, will attempt to break their duck minus four key players and possibly a fifth after it was confirmed on Tuesday that Paul O’Connell’s tournament and Test career were over, that Sean O’Brien had been banned for a week and that a decision on Jonathan Sexton’s fitness could be delayed until just before kick-off against Argentina on Sunday. Related: Paul O’Connell injury ruins chance of fairy tale…