Connacht have suffered an injury blow with Byron Ralston ruled out for the remainder of the season.
The Australian back sustained a knee injury against Munster.
Connacht say the injury is 'significant' and Ralston is set to undergo surgery next month before beginning a rehab programme.
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Organisers of the new Nations Championship have confirmed the tournament will finish with a finals weekend at Twickenham next November.
The new biennial competition will see matches between northern hemisphere and south hemisphere countries take place across the summer and autumn international windows.
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Six teams from either side of the equator will take part, with Ireland set to begin their campaign against Australia on July 4th.
