Leinster make three changes for Castres clash; Sean O’Brien misses out

O'Brien remains out with a calf injury.

Ross Molony replaces the suspended Hayden Triggs in the second row for Leinster's meeting with Castres in France tomorrow night.

Leinster are already assured of top spot in Pool 4 and a place in the quarter-finals, but a win tomorrow evening would guarantee a home quarter-final in the Aviva Stadium.