Scrum-half Rhys Webb has played his last game for Ospreys after a knee injury ruled him out for the rest of the season.
Alun Wyn Jones has signed a new national dual contract with the Welsh Rugby Union and Ospreys.
Ospreys and Wales winger Eli Walker has been forced to retire from rugby at the age of 25.
The adverse weather has forced five PRO14 fixtures to be postponed, while Exeter have delayed their Premiership game by 24 hours.
Ospreys centre Ben John is to take a 12-month sabbatical from rugby as he recovers from the latest in a series of head injuries.
Connacht, Ospreys and Scarlets all secured victories in Round 16 of the Guinness PRO14.
There were wins for Glasgow, Edinburgh, Ospreys and Zebre on Friday in Round 15 of the Guinness PRO14.
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