Johnny Sexton has been ruled out of Ireland's World Cup quarter-final against Argentina on Sunday.

He is replaced at flyhalf by Ian Madigan, with Paddy Jackson coming onto the bench.

'Post training yesterday Sexton tightened up and although scans earlier in the week were normal a further scan yesterday afternoon revealed a very minor adductor strain,' read an update from the IRFU. 'It was therefore felt that it was better to withdraw him from the game rather than risk further injury. Ian Madigan will start at outhalf and Paddy Jackson comes onto the bench.'

Meanwhile, Isaac Boss has been brought in to the squad as further scrumhalf cover in place of Jared Payne.