Former Wales prop Ceri Jones will keep hold of the reins at Pro14 side the Dragons for the remainder of the season.
Premiership champions Saracens are through to the last eight of the European Champions Cup after beating Lyon on Sunday.
Wales are set to have Taulupe Faletau available for the Six Nations, while Jonathan Joseph may be available for England.
Ryan Mills' last-gasp drop goal put Worcester Warriors into the last eight of the Challenge Cup for the first time in a decade.
All four Pro14 sides in European Rugby Champions Cup action on Saturday secured victories, three coming against French opposition.
Zebre led at half-time of their European Challenge Cup match at La Rochelle, but the hosts fought back in stunning fashion on Friday.
Joey Carbery, Rory Scannell, Keith Earls and Andrew Conway were among the tries as Munster overpowered Gloucester.
Returning to action after a broken arm proved an anxious experience for Saracens' Billy Vunipola, who is steadily regaining his poise.
Bill Beaumont, chairman of World Rugby, hailed the progress made on injury-prevention in the sport but acknowledged more needs to be done.
Three weeks before the start of the Six Nations, Sam Underhill has been ruled out of the tournament in a significant blow to England.
After four weeks out, England fly-half Danny Cipriani is back for Gloucester as they take on Munster on Friday.
David Sisi is the only uncapped player to be included in a 31-man Italy training squad that will gather in Rome ahead of the...
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France have called upon five new players for the Six Nations, including Under-20 World Championship winner Romain Ntamack.
Two-time World Rugby Player of the year Beauden Barrett says John Plumtree has the potential to coach the All Blacks.
Clermont Auvergne hammered fellow title hopefuls La Rochelle, who had won 10 of their previous 11 matches.
Wasps won for only the second time since September with a fit-again Joe Launchbury back in the side.