Northampton announced on Monday the signing of England back-row forward James Haskell on a one-year contract from rival English Premiership side Wasps.
Haskell was a member of the Lions squad that toured New Zealand in 2017 and has represented England 77 times, including at two Rugby World Cups.
"I'm really excited and humbled to be joining a giant of English rugby in Northampton Saints," Haskell told Northampton's website.
"Having had the opportunity to play against them for many years now, I know this is a club with a proud history and a set of passionate and loyal supporters who always make their presence felt.
"It's no secret that I want to continue my international career for as long as possible. The only way I can do that is by putting my best foot forward in club rugby and helping Saints fight their way back into contention for silverware."
Haskell made more than 200 appearances for Wasps during two spells, winning both the Premiership and Heineken Cup.
The player, who has also spent time with Stade Francais, Japanese club Ricoh Black Rams, and New Zealand side Highlanders, can play in any of the three positions across the back-row.
Northampton's director of rugby Chris Boyd said: "We're thrilled to have captured James's signature for next season as he's a player that can bring so much to Saints.
"Not only is he a superb leader with bags of experience at the very highest level, but James is clearly still extremely hungry to win trophies in club and international rugby."
England's James Haskell (right) has signed for English Premiership side Northampton from Wasps