Brian Carey has ended his 20-year association with Wrexham to follow former manager Dean Saunders to Championship side Doncaster Rovers.
Saunders has persauded his Wrexham number two, who first joined the Racecourse club on loan in 1991, to become his assistant at the Keepmoat.
Saunders ended his three-year reign as Wrexham boss on Friday when he replaced Sean O'Driscoll as Doncaster manager.
"I have to get the ship running the way I want it to be run," said Saunders.
Saunders had already employed his former Wrexham fitness coach Mal Purchase and former Republic of Ireland international defender Carey has followed.
The 43-year-old former Wrexham captain, who had three loan spells at the club before joining permanently from Leicester in 1996, had been on the club's coaching staff since retiring from playing in July 2005.
Carey has twice taken charge of the North Wales team and even guided them to Football League survival on the final day of the 2007 season.
"It is an opportunity I don't think he can turn down," said Wrexham's temporary manager Andy Morrell.
Morrell has brought in former Preston North End and Sheffield Wednesday first team coach Billy Barr to assist him in his first managerial role.
Wrexham coach Joey Jones, the former Wales and Liverpool defender, and former goalkeeper Michael Oakes are also assisting Morrell.