Tournament organisers also announced on Friday that the first semi-final between Clermont Auvergne and Munster in Montpellier next Saturday will be controlled by Welshman Nigel Owens.
The Amlin Challenge Cup semi-finals - Perpignan versus Stade Francais and Leinster against Biarritz - will be refereed by Ireland's George Clancy and England's Wayne Barnes, respectively.
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