Blair, who is considered one of the best forwards in the game, has been strongly linked with the Tigers since the Herald revealed on March 24 that he was a recruitment priority for the club, but no announcement has been made until now.
The 25-year-old’s impending arrival has sparked rumours of unrest at the Tigers, particularly after the long-serving prop Bryce Gibbs and boom forward Andrew Fifita were released to Cronulla for next season.
Gibbs had only recently agreed to terms for a three-year extension of his contract from next season.
Fullback Wade McKinnon and utility back Tim Moltzen have also been granted releases from their deals with the Tigers and there has been speculation about the futures of back-rower Chris Heighington and winger Beau Ryan.
The Tigers are also expected to confirm that Parramatta centre Joel Reddy is joining the club next season but the major announcement will be the recruitment of Blair, who is one of the biggest signings in the joint venture’s 12-year history. The Kiwis vice-captain was also sought after by Sydney Roosters, Parramatta Eels and the Canterbury-Bankstown Bulldogs, while the Melbourne Storm did not want to lose him.