Otago pair Glenn Dickson and Rob Verbakel will both arrive at Franklin's Gardens this summer.
Saints confirmed their latest additions on Friday, with goal-kicker Dickson, 26, an option at fly-half or centre, while 25-year-old lock Verbakel previously played for Glasgow.
Both players were key members of the Otago team that reached the 2012 ITM Cup final in New Zealand.
"We are always looking to improve and add more depth to our squad, and we believe that Glenn and Rob can excel in our Aviva Premiership, European and Anglo-Welsh campaigns," Saints rugby director Jim Mallinder said.
"Both players have experience playing in a successful team in a tough competition, and we have been impressed by what we have seen.
"They will be able to add an extra dimension to how we play."
- Sports & Recreation
- Glenn Dickson
- Rob Verbakel