Listen to BBC Radio 5 live sports extra commentary as Northampton Saints travel to Montpellier in the European Rugby Champions Cup.
Northampton Rugby Union
Saracens agree a deal to sign flanker Calum Clark from fellow Premiership side Northampton Saints this summer.
Worcester Warriors sign Northampton Saints loose-head prop Ethan Waller for the 2017-18 season.
Northampton earn a bonus-point win over Castres to end the French side's hopes of a place in the European Champions Cup quarter-finals.
Audio & Video
Near the halfway stage of the 2016-17 season, BBC Sport's Jeremy Guscott assesses the sides vying to be Premiership champions.
How to get into rugby union
How to get into rugby union - into the thick of the 15-player game or try rugby sevens, which made its Olympic debut in 2016.
Rugby alerts, newsletters and social media
Get latest scores and headlines sent straight to your phone, sign-up to our newsletter and learn where to find us on online.
Commentaries, clips and podcasts
Enjoy the best debate, analysis and interviews with BBC 5 live and World Service plus our rugby union commentary listings.
What's on BBC Sport this week
This week's sport on the BBC includes Australian Open tennis, Masters snooker, European rugby union and Ski Sunday.