The 18-year-old, who was dual registered with the Pilgrims and Peterborough United, has sealed a move to Pride Park following an impressive run of form for Dennis Greene’s side.
Ravas made 22 appearances for United, keeping five clean sheets in the process, and moves on with the best wishes of everybody at The Jakemans Stadium.
Fellow goalkeeper Sam Vince, meanwhile, completed a move to Evo-Stik League Premier Division side Hyde United over the Christmas period.