Fel Cadeirydd Chwaraeon Cymru, bydd Tanni yn atebol i Ddirprwy Weinidog y Celfyddydau a Chwaraeon am berfformiad Chwaraeon Cymru ac am gyflawni blaenoriaethau strategol.  Mae datblygu a chynnal perthynas agos â'r Dirprwy Weinidog ac aelodau allweddol o Lywodraeth Cymru yn rhan hanfodol o rôl y Cadeirydd.
As Chair of Sport Wales, Tanni will be accountable to the Deputy Minister for Arts and Sport for Sport Wales’ performance and for the delivery of strategic priorities. Developing and maintaining a close relationship with the Deputy Minister and key members of the Welsh Government is a crucial part of the Chair’s role.