Saracens number eight Billy Vunipola has called on his teammates to keep pushing as they bid to clinch the Heineken Cup and Aviva Premiership glory.

The Sarries will take on Toulon in the Cup final in Cardiff on May 24 after beating Clermont Auvergne last month.

First, they will have to travel to Allianz Park to face Harlequins for Saturday's Premiership playoff semi-final.

"The wave we are riding has been slowly building and we have ended up top of the League at the end of the regular season," the London Evening Standard quotes Vunipola as saying.

"It's not about the wave crashing with a big performance like the Clermont win, we want to keep it going and we have to win this game against Quins or else all that effort in the Premiership would have been for nothing."

Vunipola joined Saracens alongside brother Mako at the start of the season.