Beattie was named as the club's first-team coach on Friday.
Monk has already brought in his assistant from Swansea City, Pep Clotet, to aid his efforts at Elland Road and now Beattie, who also worked as part of Monk's staff at the Liberty Stadium, has also followed the former defender to Yorkshire.
Though Beattie has not been in coaching for long - he managed Accrington Stanley for 16 months before joining Swansea - he has a great deal of experience in football to draw upon for his new role.
The 38-year-old played 498 competitive senior games in a 17-year professional career for clubs including Southampton, Everton, and Rangers, as well as winning five England caps in 2003 under Sven-Goran Eriksson.
Beattie's addition is likely to complete Monk's coaching staff as Leeds look to finally get some stability in the dugout after a string of short-lived managers.
Whites supporters on Twitter seemed largely positive about the move to bring in Beattie, and there were even some tongue-in-cheek calls for the veteran to dust off his boots and lead the line.
quietly confident with Garry Monk and James Beattie at Leeds— nanny dorris (@dannynorris_) July 1, 2016
I think Beattie is an excellent addition to the coaching staff. Also, could do a job still...— James (@JamesLUFC) July 1, 2016
James Beattie worked with Monk and Clotet at Swansea, so no real surprise. Their team knew where the net was, so that bodes well. #LUFC— The Scratching Shed (@TSSLUFC) July 1, 2016
I like the Beattie appointment. He always seemed well-grounded for a footballer, plus he has serious credibility. And good hair. #LUFC— The Scratching Shed (@TSSLUFC) July 1, 2016
James Beattie first team coach. Good that.— diddlysquat (@markrikko) July 1, 2016
James Beattie in as coach? Jesus, Cellino is finally taking this ownership lark seriously.— Harold J. Sanderson (@HarryJSanderson) July 1, 2016
Monk, Clotet and Beattie. That's a management team I can get excited about! #lufc— Liam Pháidí Joe (@ismiseliam) July 1, 2016