Campbell, who spent the last year-and-a-half at RB Leipzig, will serve as the 'first team individual development coach' under Thomas Frank.
He had previously worked at Rangers' training centre in Auchenhowie for more than three years, coaching the under-18s and taking charge of their professional development programme.
He secured his position at Rangers after stints with Aberdeen and the Right to Dream Academy.
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In February last year, Campbell left Rangers to seize the opportunity at RB Leipzig.
In Germany, he served as the head of player development, aiding the transition of youth players into the first team.
As he left Rangers last year, Campbell signed out with an emotional message.
He wrote on social media: "Privileged to have spent 3.5 years at RFC Youth working with some brilliant people on & off the pitch.
"An incredible opportunity that I never took for granted, from watching academy lads play for Rangers & forging careers in the game to winning the U18 League & Scottish Youth Cup.
"Overwhelmed by the messages I’ve received from players, parents and staff which have all been greatly appreciated."