Professor McAllister was Chair of Sport Wales between 2010 and March 2016. In this role, she oversaw the most successful period ever for elite sport in Wales, with Wales winning a record number of medals in the Commonwealth Games 2014, the 2012 London Olympics and Paralympics and the 2016 Rio Olympics and Paralympics. She was also a Board member of UK Sport between 2010 and 2016, when Team GB broke its medal-winning records. She is currently a Director of the Football Association of Wales Trust. McAllister was nominated by the Football Association of Wales for election as UEFA's female member of the FIFA Council but was controversially prevented from standing. She is currently Deputy Chair of the UEFA Women's Football Committee (2017–) and Chair of the Welsh Sports Hall of Fame. McAllister is contesting the election for the female representative from UEFA on FIFA Council (April 2021).