Munster will be determined to keep their impressive winning record in this season's tournament and secure their place in the last eight of the Heineken Cup when they host Castres Olympique
The Irish province, who lifted European rugby's biggest prize in 2006 and 2008, have swept all before them in Pool 1 this season and are already favourites to qualify for the quarter-finals.
Castres have only managed one win during this campaign and face a daunting prospect against a side that has won the last 16 Heineken Cup games at ThomondPark.
The French Top 14 side are at the foot of the Pool table and have nothing to play for but pride over the next two weekends and will not qualify for the quarter-finals of the tournament.