The 23-year-old Wales international can play either center half or right back and is a familar face to the gaffer, having played under Jackett while the pair were at Swansea City together.
Elsewhere, striker Adrian Forbes has gone out on loan to Grimsby Town for the rest of the season. The 30-year-old has made just two appearances for The Lions this season and has been unable to make an impact on the first team squad this season.