"Dwane's 16-plus years in NBA coaching circles working with some tremendous basketball mentors coupled with his proven ability as a defensive architect will serve as a great backdrop for the future approach of this team."
The 54-year-old Casey signed a three year-deal, taking over a Raptors team that has not made the playoffs since 2008 and finished the 2010-11 NBA season with the third-worst record in the league.
Casey began his NBA coaching career in 1994 as an assistant with the Seattle SuperSonics franchise that has since relocated to Oklahoma City.
Casey earned a 33-49 record during his first season with Minnesota and was relieved of his duties midway through the 2006-07 season after compiling a 20-20 record.
"One thing that I do plan to do here in this upcoming season is help this team develop an NBA defensive identity," Casey told a news conference.
"I think that's the number one goal, the number one thought process with me going in."
(Writing by Frank Pingue and Julian Linden);