Southampton are hoping Juric can inspire an incredible comeback heading into the second half of the Premier League campaign.
A statement read: "Despite the club’s current position in the Premier League, we remain focused on fighting for survival this season and believe this appointment will provide us with the grit and determination needed to improve results on the pitch.
"Juric, a former Croatia international as a player, arrives at Saints on an 18-month contract with a reputation for helping his teams punch above their weight."