Tierney, who became the WRU’s first female CEO in January 2024, confirmed she will take time away from her duties to focus fully on treatment and recovery.
“This has not been an easy decision, but it is one I must make to focus fully on my health and recovery,” she said in a statement.
“I am grateful for the support I have already received from my family, friends, and colleagues, and I am confident in the team’s ability to continue our work during my absence.
“I kindly ask for understanding and privacy during this time.”
WRU chair Richard Collier-Keywood said the organisation’s thoughts were firmly with Tierney as she begins her treatment.
“I, together with the whole of the Board and everyone involved with Welsh rugby wish Abi well over this period and the WRU is committed to supporting her during this time,” he said.
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Collier-Keywood confirmed he will take a more active role in the immediate future to ensure the WRU continues to operate smoothly, while also giving Tierney the space she needs.
“In my role as Chair, I will continue to have overall responsibility for the WRU and in order to provide cover and give Abi the space she needs, will be more involved in the immediate future.
“Abi and the Board have recruited a strong executive team which will continue to lead the WRU on a day-to-day basis, supported by Alison Thorne,” he added.
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The WRU is currently engaged in a pivotal consultation on the future structure and sustainability of elite rugby in Wales.
Collier-Keywood said that work would continue as planned, with Director of Rugby and Elite Performance Dave Reddin leading the process alongside key board members.
“The most important topic on our agenda right now is the consultation on the future of elite rugby in Wales,” he said.
“This will be led by our Director of Rugby and Elite Performance, Dave Reddin, as a member of the executive and I will take overall responsibility for its successful delivery, working closely with Board members including Malcolm Wall as Chair of the Professional Rugby Board, Amanda Bennett who leads at Board level on our Women’s game and Andrew Williams.”
Tierney, a former senior Home Office official, took over at the WRU amid a period of major change for Welsh rugby, including governance reforms, financial challenges, and ongoing efforts to grow the women’s game.
She is expected to resume her duties once her treatment and recovery allow.
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