It's a form of Six Nations preview this afternoon as we have 4 Ireland v France matchups in the European Champions Cup this afternoon.
Connacht have been beaten by Lyon by 34 points to 20 in the opening game of the day.
Munster will hope to get their Pool 3 campaign back on track - they're away to three-time champions Toulon in around 15 minutes time.
James Lowe makes his first appearance of the season as Leinster welcome Stade Francais (pr: Fron-say) to the Aviva in Pool 4.
Kick-off there is at 5.30.
And Kingspan Stadium is sold out for Ulster’s Pool 2 encounter with a star-studded Toulouse.
There’s an 8pm start in Belfast.