European Professional Club Rugby will make "every effort" to finish this season while also planning for the future.
Jordi Murphy and Will Addison have signed contract extensions with Pro14 side Ulster.
Scarlets have confirmed Wales flanker James Davies will miss the rest of the season as he requires hip surgery.
Benetton Treviso were prevented from playing at home last weekend because of the coronavirus, but returned to action by beating the Dragons.
Peter Robb's dismissal did not prevent Connacht from closing the gap to the Scarlets to only two points ahead of their clash on Friday.
Munster and Dragons earned home Pro14 victories over Scarlets and Cheetahs respectively.
Ryan Baird and Dave Kearney both scored hat-tricks as Conference A leaders Leinster routed Glasgow Warriors on Friday.
Cian Healy will miss the remainder of the Six Nations after the prop was injured during Ireland's loss to England.
The Ospreys have turned to Toby Booth to take over as head coach when he finishes his assignment with Harlequins.
Wales full-back Liam Williams has joined the Scarlets ahead of schedule, while Rhys Webb joined Bath ahead of a move to Ospreys.
More Italian sporting fixtures have been delayed by the coronavirus, with Zebre & Benetton Treviso seeing matches postponed.
Southern Kings and Benetton Treviso both fell short on Welsh soil as Scarlets and Cardiff Blues earned Pro14 wins.
After losing to Ospreys, Ulster bounced back by defeating Cheetahs, while Glasgow Warriors beat Dragons to move into third in Conference A.
Leinster became the first Pro14 side to win their first 12 league matches of a season after they overcame Ospreys on Friday.
The Ospreys claimed only their second Pro14 win over the season at the expense of high-flying Ulster in a stormy Swansea.
It was a record-breaking outing for Munster in Pro14 action on Friday, while Glasgow Warriors were also big winners.