Leinster boss Joe Schmidt has admitted he expects a tough test when his side head into the Heineken Cup semi-final.
The Irish outfit booked their place in the last four of the prestigious European competition, after they ran out convincing winners over fellow RaboDirect Pro 12 side Cardiff Blues on Saturday.
With a convincing 34-3 victory over the Welsh club in Dublin, Leinster are now set for an away clash against either Saracens or Clermont Auvergne in the semi-final of the tournament.
With Brian O'Driscoll returning from injury, Leinster have started to build momentum in the competition but Schmidt believes his side will be up against it when they go on the road in the next stage of the Heineken Cup, as they look to defend their European crown.
He said: "The semi-final will be horrendously tough. To win away from home in a semi-final doesn't happen very often.
"It is an extremely tough feat to achieve."
Leinster saw off Northampton Saints in a thrilling Heineken Cup final last season and are on course to retain their title this term but will have to see off either Sarries or Clermont to reach the showpiece final at Twickenham on May 19.