Ospreys take on Toulouse, while Scarlets are at home to Exeter.
KO for both games is at 13:35
More top news
A scientist from Carmarthen has won the world's top prize for animal conservation for his work in saving nine species from extinction.
A man has been arrested on suspicion of murder after a woman's body was found in south Wales.
Tomorrow you'll be given the opportunity to vote in the National Assembly for Wales and Police and Crime Commissioner elections.