Betsen warns Wasps to keep eye on Yachvili

So, when it comes to previewing the game this weekend between his two former clubs it might be difficult to get him to pick a winner. But Wasps press officer Alison Donnelly did her best to prise out of Serge a few thoughts on who will reach the last four.

"This season has been very difficult for Biarritz especially because of the impact of the World Cup. They didn't really target bringing in a lot of new players and I think that they have struggled from there," Betsen told London Wasps website.

"They have been fighting to make sure that they were not relegated and they are not performing as well as we are used to. Even so, Wasps will have to be very careful when they come to Adams Park because they can be extremely dangerous. Both teams I think will look to play exciting rugby."

Both Wasps and Biarritz eased their relegation worries at the weekend with morale boosting home wins in their respective domestic leagues, with the French club's 15-14 triumph over ASM Clermont Auvergne making in four in a row in the Top 14.

Scrum half Dimiti Yachvili was Biarritz match-winner with five penalties last weekend and Betsen ranks the French scrum half as the key man in the game,

"Yachvili is so important to Biarritz. He brings the spirit and the passion of the club to his game and everyone follows his step," added Betsen.

"He is also a great kicker and has managed to kick a lot of points for Biarritz over the years, and Wasps will have to look out for him. If they make mistakes he can punish them.

"Biarritz' main focus is still definitely on the Top 14, but now that they know that they probably won't be relegated they will be well settled and Wasps will have to take them very seriously. The French spirit and the French mind-set mean that they might well play some of their best rugby in the Amlin Challenge Cup because they have lifted some pressure off themselves."

Tickets for the game at Adams Park on Saturday are still available and start at just £15. Bookings can be made over the telephone by calling 0844 225 2990 or in person at the Ticket Office at Adams Park or online at www.wasps.co.uk