Scarlets winger Mark Jones will miss his side's final two Heineken Cup matches this month and now faces a race against time to be fit for the start of the RBS 6 Nations.
The 29-year-old wing has been forced to undergo an appendix operation that is likely to sideline for at least three weeks.
It means the man who helped Wales win the Grand Slam last season will have little time to prove to coach Warren Gatland that he is fit and ready to take his place in the opening championship match against Scotland at Murrayfield on Sunday, 8 February.
With 43 caps to his credit, Jones has become one of Wales' most consistent performers on the international stage and will be hoping to use the Six Nations to push his claims to a place on the British & Irish Lions tour to South Africa.
The Welsh Rugby Union has awarded a unique 'President's Cap' to a specific group of players who represented their country between 1945 and 1979, but missed out on international recognition at the time.
Prabhat Mathema, the WRU's National Medical Manager explains the four part Pitchside Suspected Concussion Assessment process the IRB has devised that is being implemented throughout the Dove Men Series and in the LV= Cup this season, which includes the provision for a five minute temporary substitution to allow an assessment to take place.