Sam Warburton is to undergo surgery following the recurrence of a long-standing neck injury and faces up to four months out.
Cardiff collapsed in the closing stages as Leinster sprinted to a late 37-9 PRO14 bonus-point win at the RDS.
Wales international flanker Ellis Jenkins is facing a lengthy lay-off due to a hamstring injury.
Richard Cockerill made a winning start as Edinburgh head coach as his side pulled off a 20-10 victory at Cardiff.
Seven teams from the PRO14 and Premiership are represented including Scarlets, Saracens and London Irish.
With the new Guinness PRO14 season about to get underway, test your knowledge of the competition with our quiz.
We take a look at each of the seven teams in the new PRO14's 2017/18 Conference B, including defending champions Scarlets.
With the PRO14 about to embark on a new venture as a global league, we take a look at each team in Conference A.
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