Hall and T-Pole both played for Northland last seaon, with T-Pole returning to the Stags for the first time since 2007.
Pirates-Old Boys lock Craig Smith and club team mate Juan Koen are amongst the newcomers to the team, along with Naulia Dawai and Auckland imports Gareth Williams-Spiers and Willis Halaholo.
The Stags go into a two-day camp in Bluff tomorrow before their first preseaon game on Saturday, against North Otago in Oamaru.
Southland's season opener is at home against Tasman on August 17.
Stags 2013 squad: Tayler Adams, Nicholas Barrett, Josh Bekhuis, Tim Boys, Tim Cornforth, Naulia (Tu) Dawai, Elliot Dixon, Scott Eade, Michael Fatialofa, David Hall, Willis Halaholo, John Hardie, Keanu Kahuhura, Nemia Kenatale, JP Koen, Jamie Mackintosh, Marty McKenzie, Bryan Milne, Tukiterangi Raimona, Robbie Robinson, Craig Smith, Hale T-Pole, Talemaitoga Tuapati, Cardiff Vaega, Gareth Williams-Spiers. *one to be added.