One of two off-season signings from South Yorkshire neighbours Doncaster, Douglas has signed a two-year deal with the club.
The prop forward came through the Castleford Tigers system and has enjoyed Championship loan experience with Dewsbury Rams and Halifax Panthers before spending three seasons with the Dons.
The 24-year old will wear the number eight for Sheffield in 2022, following the retirement of Scott Wheeldon.
Personal Sponsor: Jenny CroftsPlayer Information
Date of Birth: 17/08/1997