The 43-year-old teams up with the Hoops manager for the fourth time, having worked with the Welshman in a similar role at the Etihad Stadium, as well as Blackburn Rovers and Wales
Rigg’s role is similar to that of the one he held at the Etihad Stadium and reunites with Hoops manager Mark Hughes, whom he worked with in Manchester, as well as Blackburn Rovers and the Welsh national team.
"I am very pleased to be here," Rigg told the club's official website.
"When I sat down with the owners and Mark [Hughes] recently they sold the project at Queens Park Rangers to me. I see where they want to take the club and it is something I want to be a part of.
"I have worked with Mark in a number of different roles so I have a very good understanding of what he wants and what he needs.
"Player acquisition is a big part of football and it is where an enormous amount of investment is made. That's where we must get it right.
"My role involves a mixture of looking at the immediate needs for the football club as well as trying to make sure we have a long-term plan in place for bringing players through into the first team."
As technical director, Rigg will be expected to identify talent over each age group and will work with all departments to enhance the player development process to bring the best quality into the club’s first-team.
Rigg’s former roles include academy manager of Sheffield Wednesday, technical director for the Welsh FA, and chief scout at Blackburn Rovers.