Fox, who played 46 Tests for the All Blacks from 1985 to 1993, will step down from his current position on the Blues board to take up the All Blacks' selector job.
He will join new coach Hansen and Foster on the All Blacks selection panel which will select squads for each of their regular campaigns - the June tests, the renamed Rugby Championship (formerly the Tri Nations) and the End of Year Tour.
"The chance to be involved with the All Blacks again - a team I care passionately about - was too good an opportunity to turn down and I was flattered when Steve called me and said he wanted me to be a selector,'' Fox said.
Fox added he was "excited by the challenges'' the All Blacks faced. "They climbed their Everest this year and now the aim will be to maintain that success. That's going to be the exciting thing for me.''
Aussie McLean said: "This is a huge responsibility which I have been given and I'm honoured and humbled. I'm excited at what lies ahead and ready for the challenge.''
Hansen said he was delighted to be able to announce the new positions.
"Grant Fox is not only a legend of our game but also one of the most astute people. I wanted to find someone independent from the team who had the ability to break down a player's game, analyse their strengths and weaknesses and bring a fresh viewpoint to the selection process, and he's that man.''
Biographies
All Blacks assistant coach Ian Foster was Chiefs coach from 2004 to 2011, taking the team to the semifinals in his first year and the final in 2009.
He was co-coach of the Junior All Blacks from 2005 to 2007, during which time the team won a two-test Series against Australia A, the inaugural IRB Pacific Five Nations tournament and the expanded Pacific Nations Cup. He also co-coached an All Blacks trial team in 2005.
Foster is the most-capped Waikato player (148 games) and played 28 games for the Chiefs.
All Blacks defence coach Brian "Aussie'' McLean is one of New Zealand's most well-regarded coaches. He has had more than 20 years coaching experience from club to international level, most recently as assistant coach of Samoa at the 2011 Rugby World Cup.
He lead the New Zealand under 19 team at five world championships, including three victories, won titles with Canterbury in 2001 and 2004, provided analysis and coaching for the Crusaders (1999 to 2000) and was assistant coach with the Hurricanes (2006-2008).
All Blacks Selector Grant Fox is an All Blacks legend. He played 189 matches for Auckland from 1982 to 1993 scoring 2746 points, and 46 Tests for the All Blacks from 1985 to 1993. He was part of the 1987 Rugby World Cup-winning All Blacks side and finished his All Blacks career with a then-record 645 points.
He has remained prominent in rugby since his playing days: he has been on the coaching staff of Auckland and the Blues, as well as a Blues board member; and most recently was a highly-respected comments man on Sky Television.
