Wales centre Sonny Parker will be out for at least six weeks after surgery to correct a groin problem and is likely to miss most of the RBS 6 Nations.
Parker strained knee ligaments on Boxing Day playing for the Ospreys and has now opted to have a long-standing groin problem corrected.
Wales have already lost Ian Evans for the RBS 6 Nations campaign while fellow lock Robert Sidoli is unlikely to be fit for the opener against Ireland on 4 February and flanker Jonathon Thomas is also struggling with a shoulder injury.
The RBS 6 Nations Championship 2015 was not poised to go down as one of the more "vintage" Championships, though there was great anticipation as the action headed into its final day. What transpired was something that nobody could foresee: "The Greatest Day in Rugby's Greatest Championship."