Connacht second-row and former Chiefs Super Rugby champion Craig Clarke has been forced to retire through repeated concussions.
The 30-year-old is acting on the medical advice of a number of specialists both from within Irish Rugby and elsewhere.
Craig joined Connacht at the start of the 2013/14 season on a three year deal. His previous experience with the Chiefs as a double Super Rugby winning captain meant that he played a key role both on and off the field at Connacht.
His leadership credentials became apparent upon his arrival at the Sportsground and he was appointed captain for the season. Craig made 15 appearances in the Connacht jersey, starting in the second row on every occasion which included five Heineken Cup games.
His last game for the province came against Heineken Cup finalists Saracens at Allianz Park in January. A head knock sustained in that game ruled him out of any further action while medical experts carefully monitored his symptoms over the last few months.
Based on the medical advice presented to him, Clarke made the decision to end his playing career.
"Craig was obviously one of the biggest signings we've ever had at Connacht and it was huge for us to get someone of his experience," said Team Manager, Tim Allnutt.
"But he also had all the qualities of a Connact team man and we are extremely disappointed for him that his time with the club has been cut short. As is the case with every player, the priority is his health and we're thankful that every precaution has been taken here.
"Despite his short stint here, Craig brought an abundance of knowledge and expertise with him to Connacht. He was an enthusiastic teacher who gave generously of his time to the younger forwards.
"He will of course be missed but we wish himself, Veree and their daughter Isabella all the best for the future in New Zealand and thank him for everything he has done in his short time with Connacht."
"Craig could see the potential we have as a young team and he wanted to be a part of that," added head coach Pat Lam.
"He was continuously driving standards and challenging areas that needed to be challenged. His consistent, high class performances on the pitch meant he earned massive respect from the outset.
"Even when he was unable to play, he was always helping and mentoring others, encouraging guys from the sidelines in training, staying around to do analysis on other teams and sitting with Dan (McFarland) on the forwards' play. His work ethic and attitude was inspirational and he had a major influence, leaving a lasting impression on the squad."
"There have been so many people who have helped shape my rugby career and my life and I want to thank them all," added Clarke.
"My family, especially my wife Veree and my parents Brian and Bev, have been there for me through it all. Everyone involved in my school, club and professional rugby including team mates, coaches, management staff, medical staff, referees, administrators and volunteers have all helped me along the way.
"I am proud of what I have achieved. I have experienced tough times with teams which has just made me appreciate the good times all the more. While I will always be disappointed not to have worn the black jersey of my country, I will sleep easy knowing that I gave it a real crack, particularly in my last three seasons playing in New Zealand.
"Of course I understand that health takes priority over sport every time, but I still can't escape the disappointment that I couldn't contribute to Connacht as I would have liked and envisaged before my arrival.
"It was a challenging season in terms of results, but so rewarding in other ways. There are a fantastic group of people here at Connacht and they work extremely hard for everything they have.
"I really enjoyed getting to know my teammates and working with the coaches. My rugby knowledge benefited hugely, especially around Northern Hemisphere set piece play."