Published Friday, 06 July 2012
Steven Davis captained Rangers before leaving the club. (© UTV)
The 27-year-old previously captained the Scottish side, but left after rejecting a transfer to the newco club.
His three year contract with the newly-promoted Premiership side marks his return to the League, where he previously played for Aston Villa and Fulham.
"I'm delighted to get everything done and dusted, and I'm looking forward to getting started. There was quite a bit of interest in me from other clubs, but after speaking to the chairman and the manager I saw the level of ambition the Club has shown," the skipper told the Southampton official website.
"They've had a lot of success over the past couple of years to get to this stage, and they don' want to stand still - they want to keep moving forward, and that was a big thing for me.
"Now I'm just looking forward to getting down, getting to know the boys and getting started."
Manager Nigel Adkins said he was very pleased at the new signing.
"Obviously the work the club has gone and done to make it happen is really promising for the future.
"Steven's an experienced player - a very talented football player who has played international football, captained his country, captained Rangers and played in the Premier League, so he's at a good age and comes with a wealth of experience as well."
Davis is the latest player to leave Ibrox, following fellow NI player Kyle Lafferty who recently signed for Swiss side Sion.