Collier-Keywood had taken on additional responsibilities during Tierney’s absence and will continue to do so before her structured transition back to full-time working.
Malcolm Wall, who is chair of the Professional Rugby Board (PRB) and remains a WRU board director, will continue to spend additional time supporting the executive leadership on the proposed implementation of the new model for elite rugby in Wales.
The WRU executive team also includes Geraint John (community director), Leighton Davies (chief commercial officer), Lydia Stirling (chief people officer), Dave Reddin (director of rugby & elite performance) and Gavin Marshall (chief operating officer).
“Initially, Abi will start a phased return, working part-time and concentrating on getting up to speed,” said Collier-Keywood.
“The work on implementing the conclusions of the recent consultation will continue to be led by Malcolm Wall.
“I will continue to spend time supporting the executive during this period.”
Before starting her enforced absence, Tierney was at the press conference in August where the WRU stated it wanted two professional sides.
Tierney missed the month-long public consultation in September, which was overseen by Reddin.
The outcome was announced in October with the WRU stating they now prefer three teams with one professional side to be cut.
There will be three licences awarded to sides with one in Cardiff and one each in the west and east.
The WRU has not provided an exact date yet on when that will occur or how they will achieve their goal of losing a men’s professional team.
