Jack is a product of the illustrious Celtic youth system. The big built young defender spent the majority of his youth career with the Glasgow giants at Lennoxtown.
Upon his release from Celtic, Jack joined up with Scottish Championship side Partick Thistle and spent a year in their development squad before being released in the summer.
Jack adds a physical presence to the squad and provides healthy competition for places along the back line this season.
Gaffer's Quote: "Technically good passer of the ball, with adding aggression to his game Jack will be an excellent player."