Ulster's players and staff are set to undergo a round of P-C-R testing for COVID-19 today.
Four of the northern province's squad have tested positive for coronavirus - and Saturday's match against the Scarlets has been cancelled.
Scarlets have been awarded four-points from the fixture and Ulster C-E-O Jonny Petrie says calling off the game was the right decision.
Munster will look to keep their bid to reach the final of the Rainbow Cup on track tonight.
A bonus-point victory for the Reds against Cardiff would send them top of the European section for 24-hours at least.
The Thomond Park encounter is the last home match for Tommy O'Donnell, James Cronin and captain for the night CJ Stander.
Cardiff haven't beaten Munster since 2018 and there's a twenty-five-to-eight kick-off in Limerick.
