Johnny Sexton ruled out of Leinster's Champions Cup semi-final with La Rochelle

Leinster's Johnny Sexton. Picture: INPHO/James Crombie

Leinster out-half Johnny Sexton has been ruled out of Sunday's Heineken Champions Cup semi-final against La Rochelle.

The Ireland captain suffered a head injury in their quarter-final victory over Exeter Chiefs and missed Saturday's loss to Munster.