That game kick's off at 5:30pm in Thomond Park.
Captain Tadhg Beirne will lead Munster on his 100th appearance for the province against Castres at Thomond Park tomorrow.
There are three changes to the side that were narrowly beaten in Toulon last weekend as Thaakir Abrahams, Niall Scannell and Jean Kleyn all come into the starting 15.
Craig Casey has recovered from a shoulder knock to start in the half-backs with Jack Crowley.

Tuesday Morning Sports Update
All Ireland Football Championship Opening Round Fixtures Confirmed
Tommy O'Brien Among Injury Doubts For Leinster's Champion Cup Final On Saturday
Monday Morning Sports Update
Sunday Evening Sports Update
Mourinho's Benefica Go Unbeaten but Miss Title
Brave Kildare Fall Short in Leinster Ladies Final
Chelsea Appoint Xabi Alonso as New Manager