Scotland scrum-half and captain Greig Laidlaw is a huge loss in the Six Nations, says Wales scrum-half Rhys Webb.
Hanno Dirksen signs a new two-year contract with Ospreys, keeping the wing at Liberty Stadium until 2019.
Cardiff Blues centre Cory Allen joins Ospreys at the end of the season insisting the move will improve him as a player.
Newcastle Falcons continue to add to their squad with the signings of brothers Josh and Joel Matavesi.
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Munster return to the top of the Pro12 with a hard-fought win to end Ospreys' 13-match unbeaten run.
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