Seiuli joined the ‘Men of Gwent’ from Glasgow Warriors last year and made 21 appearances for the region in an impressive debut campaign.
The 29-year-old missed only one game during last season and will be vying with Jones and Evans for the No 1 jersey at Rodney Parade.
“Aki has been a consistent performer for us who showed his durability by featuring in all but one fixture last season. We’re pleased that he will now remain with us and ensure we have depth and real competition for places in our front row,” said Dragons director of rugby, Dean Ryan
Wales hooker Bradley Roberts is another of Ryan’s new recruits in the front row and he also has Leon Brown, Chris Coleman and Lloyd Fairbrother to compete for the tight head spot. Josh Reynolds is another academy graduate who plays in the front row.
“I’m really happy to be signing on and believe things will change next year, with the new signings building on the quality we already have,” said Seiuli.
“I’ve made some good friends over here and enjoy living in Wales. I’m also looking forward to playing alongside one of my good mates in Sio Tomkinson next season. I’m already looking forward to a better season next year because I know we have got the squad to do that.
“We have a great bunch of lads and a good group here who are all ready to go and do some good things next year, and that’s what has influenced me to stay on.”
Former New Zealand U20 cap and Highlanders Super Rugby centre Tomkinson is one of nine new signings already announced ahead of the new season. One of four back line recruits he is joined by the returning Angus O’Brien, who has signed from the Scarlets, former Bath centre Max Clark and ex-Munster, Northampton Saints and Clermont Auvergne outside half JJ Hanrahan.
As well as front row signings Jones, Evans and Roberts, Ryan has also recruited Exeter Chiefs back five player Sean Lonsdale and former Sale Sharks and London Irish lock George Nott. Of his nine signings, only Tomkinson and Hanrahan aren’t Welsh qualified.