The provinces are set for a penultimate weekend Champions Cup triple-header after the final pool fixtures of Europe's flagship competition were announced.
Munster will travel to the Allianz Park for their must-win Pool One game against Saracens at 1.00pm on Saturday January 17, with Ulster's ominous fixture away at Toulon kicking off at 4.15pm the same day.
Later that evening at 5.30pm Matt O'Connor's Leinster will face Castres at the RDS, again needing a healthy win to keep their hopes of progression to the knockout stages alive.
The following weekend Leinster travel to the Ricoh Arena on Saturday January 24 to face London Wasps in a game which is likely to decide the fates of the two clubs, kick off 1.00pm.
Later that day Ulster round off their European campaign with the visit of Leicester Tigers at 5.30pm, while Munster's final fixture against Sale Sharks will kick off at 3.15pm on Sunday 25.
All of the province’s remaining fixtures will be shown live on Sky Sports, apart from Leinster’s visit to Wasps which will be on BT Sport.
