European Professional Club Rugby have announced a change of referee for Saturday's match between Leicester Tigers and Ulster Rugby in Belfast.French official Romain Poite was originally appointed for this final fixture in Pool 3 of the European Rugby Champions Cup, but he suffered an injury during the match between Saracens and Munster in Round 5.   He has now been replaced by fellow French referee Pascal Gauzere, who was also in charge of Tigers in the win over the Scarlets at Welford Road last Friday.