Nick Williams has signed a two-year extension to his contract at Ulster which keeps him at Ravenhill until 2016.
Ryan Jones has suffered a new injury setback and is ruled out of making his comeback against Ulster on Friday.
Edinburgh have suffered a blow with the news that Perry Parker has been ruled out for up to four months.
The Ospreys joined Glasgow at the top of the RaboDirect PRO12 table after a 43-26 victory over Connacht in Galway.
Richard Cockerill believes players will remain loyal to their clubs over England as the dispute over Europe rumbles on.
Paul O'Connell made a successful return in Munster's workmanlike RaboDirect PRO12 win over the Newport Gwent Dragons.
Returning Lions Tommy Bowe and Rory Best made the perfect return to Ulster colours as the hosts beat Treviso 32-13.
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