The role-playing games will be released on the PlayStation Store "in the near future", developer Ghostlight wrote on its official blog.
Digital Devil Saga is part of the Shin Megami Tensei series of video games, which incorporates titles such as Persona and Devil Summoner.
Digital Devil Saga grants players the ability to transform into demons, which can be used to unleash powerful spells and abilities in battle.
The titles are developed by Atlus, the company behind recent Xbox 360 and PlayStation 3 release Catherine.
The announcement comes days after the first PlayStation 2 games were released on the PlayStation Store.
> Read our Catherine review
Watch a trailer for Catherine below: