England prop Alex Corbisiero will join Saints this summer, the club has confirmed.
And new deals for front row forwards Alex Waller and Tom Mercey have also been announced.
Corbisiero will join from London Irish and help fill the void left by loosehead Soane Tonga’uiha, who is set to join Racing Metro.
The 24-year-old has 18 England caps to his name and has been included in this year’s Six Nations squad.
Waller was Saints’ young player of the year last season, while Mercey has provided more than able cover for Brian Mujati and Paul Doran-Jones at tighthead this season.