Leinster captain Leo Cullen has described his side's Heineken Cup semi-final win over Clermont Auvergne as "intense".

The 15-19 triumph for the defending champions in France has set up an all-Irish final against Ulster next month.

"To be honest it was pretty intense out there," Cullen revealed. "I think both teams made quite a few mistakes considering the quality of players out there.

"I think a lot of it was to do with the pressure that was there as well. It was one of those games that could have gone either way."

Leinster will meet Ulster at Twickenham Stadium on Saturday, May 19.