Hailing from the Cumbria area of England, Addison was educated at Queen Elizabeth Grammar School in Penrith and then continued his education at the University of Manchester.
A product of the Sale academy, Addison is a versatile member of the back division who can operate comfortably at either wing, fullback or centre.
Will made his first-team debut for the Sharks in 2011 and also represented England at U20 level.
Addison penned a three year deal with Sale in October 2016 & Sale Sharks gave Addison the captaincy for the 2017/18 season.
In March 2018, Addison announced that he will be leaving Sale at the end of the season to join Ulster in the Pro 14, having made over 100 appearances for the club, scoring 150 points.
Having spent almost 10 years with the Sharks, Addison chose to pursue his ambition of playing international rugby in Ireland, having qualification through his family.
Ahead of the 2018/2019 Champions Cup, Addison has had 18 European Cups appearances scoring 2 tries and 18 points.
Addison made an instant impact at Ulster and earned a call-up to the Ireland squad for the 2018 November Tests.
In October 2018, he was named as one of two uncapped players in Ireland's squad for the Rugby Weekend fixture against Italy in Chicago.
Addison suffered a season-ending back injury which ruled him out for the majority of the second half of last season and it was thought that he would also miss out on the opportunity to play in the Rugby World Cup after undergoing surgery in April.
However, he recovered ahead of schedule to take his place in the squad.
|2018 - present|
|2011 - 2018|
|2018 - 2019|