Ospreys take on Toulouse, while Scarlets are at home to Exeter.
KO for both games is at 13:35
More top news
Some very wet weather will sink it's way south and east overnight, with mist and murk developing around coasts.
The Wales Rugby squad are currently in Switzerland at a gruelling conditioning training camp ahead of the World Cup in September.
Wales joined the rest of Britain today in falling silent to remember those who were killed in the July the 7th bombings.