Tu'ipulotu played in two World Cups for Tonga
Worcester Warriors have signed centre Sione Tu'ipulotu and prop George Potter from Plymouth Albion, following their promotion to the Premiership.
32-year-old Tongan international Tu'ipulotu was recently named Plymouth's player of the season.
Porter, 21, won the Mike Turner Memorial Trophy for most promising young player at Albion last season.
The former England Under-18 international played in every one of Plymouth's league games last season.
Tu'ipulotu, who has played at two World Cup Finals for Tonga, in 1999 and 2007, previously played for Pontypool, Caerphilly, Newport Gwent Dragons.
He joined Plymouth in 2009 and has been a star performer for the club over the last two seasons at Brickfields.
"I have tracked Sione since he was at the Dragons and we are confident he can make a big impact at Sixways and will join us to primarily play as a centre," Warriors head coach Richard Hill told BBC Hereford and Worcester.
"Sione has been one of the key performers for Plymouth Albion the last two seasons.
George had a superb year in the Championship and played almost every minute for Plymouth
Worcester head coach Richard Hill
"He is a very powerful centre and in the Aviva Premiership you need those types of players because defences are so well drilled and strong," he added.
Gloucester-born prop Porter also joined Plymouth Albion in 2009 and was rated as one of the brightest young talents in the Championship.
The former England Under-18 international will challenge Matt Mullan and fellow new recruit Ceri Jones for a starting spot at Sixways next season.
Hill feels Porter has a very bright future in the game and feels he will develop his game further at Sixways.
"George had a superb year in the Championship and played almost every minute for Plymouth," he said.
"He is very much the modern day prop and impressed (Warriors prop) Tevita Taumoepeau when we faced Albion during the season.
"He earned real respect from our front row and to get an endorsement off Tevita shows he is a real talent."