The Round 2 Heineken Cup match between Castres Olympique and Munster will be played at Stade Ernest-Wallon in Toulouse.
The Pool 1 contest between the Top 14 club and the two-time champions will go ahead on Saturday, 19 November as scheduled with kick-off at 4.40pm local time.
Munster open their campaign with a home game against last season's beaten finalists, Northampton Saints, on Saturday, 12 November.
As part of the build-up to next month's Cardiff 2014 Heineken Cup and Amlin Challenge Cup finals weekend, ERC has joined forces with the WRU, Cardiff Blues and adidas to develop an annual grassroots community rugby programme targeting young players.
The Ulster Rugby full back, Jared Payne (No 15), has been suspended for two (2) weeks following an independent Disciplinary Hearing in Dublin arising from the Heineken Cup quarter-final match against Saracens at Ravenhill Stadium on Saturday, 5 April.