Champions Cup round 1: All you need to know

It's round one of the Investec Champions Cup as Connacht, Ulster, Munster and Leinster begin their European adventures.

Can Leo Cullen's four-time champions get over the line again after narrow losses to La Rochelle in the last two finals? The rivals face off on Sunday.

Munster, winners in 2006 and 2008, are the URC champions and will aim to bring back the glory days of Europe once more. They welcome debutants Bayonne to Thomond Park on Saturday.

Ulster, the 1999 champions, are in action earlier on the same day, with Bath the hosts at The Rec.

Connacht are the first Irish side in action as they welcome Bordeaux to the Sportsground this evening.

Here's all you need to know about round one.

ONLINE

We'll have live blogs, live scoring, reports and reaction across the weekend.

TV

Munster v Bayonne is live on RTÉ2 and RTÉ Player on Saturday, with coverage getting under way at 16.45pm. Connacht v Bordeaux, Bath v Ulster and La Rochelle v Leinster are on TNT.

RADIO

There will be live commentary of Munster v Bayonne on Saturday Sport on RTÉ Radio 1.

WEATHER

Galway is in for wet and windy conditions all Friday but there may be some respite as the forecast is for the rain to stop ahead of the 8pm kick-off. Temperatures around 10C.

More pleasant conditions are forecast for Bath for Saturday afternoon, sunny and around 11C.

Slightly cooler in Limerick on Saturday afternoon at 8C with light rain showers predicted.

La Rochelle is set for cloudy and increasingly windy conditions in about 15C.

Connacht kickstart the Irish European adventure as they welcome Bordeaux-Begles to the Sportsground.

Pete Wilkins side have fallen off the pace in the URC after winning their opening three matches and are looking to avoid a third straight loss in all