Sean O'Brien out of Leinster’s PRO12 semi-final

Leo Cullen’s men face Scarlets at the RDS Arena tonight, kicking off at 7.45pm.

Sean O'Brien will miss Leinster's Guinness PRO12 play-off clash against the Scarlets on Friday night.

Leinster said that the Ireland international flanker was suffering from tightness in his calf and a decision was taken "not to risk the injury further."