King, who left the club earlier in June to join Frickley Athletic, has returned to the Northern Premier League Premier Division club ahead of the 2021/22 season.
He featured in the club's pre-season friendly at Ossett United, coming off the bench to play in the second half of the 2-1 win at Ingfield.
“I went there and it’s not for me, I think I can still play and contribute at NPL Premier Division level," said King who contacted Gladiators boss Paul Phillips asking if he could return.
“Matlock’s a great club, I know the club and how well it’s run. I want to play for Matlock, work hard and hopefully be part of a successful season for the club. When I was injured I was treated very well by the club and for me coming back’s a no brainer.”
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