South African forward is on his way to Saints
The flanker, who turned 28 on Thursday, will arrive from Aurillac this summer.
The French Pro D2 club wished Adendorff well on Twitter.
They wrote: "We thank Shaun Adendorff for being part of the team of @SArugbyofficiel these last two seasons. Shaun will join the English Championship with @SaintsRugby next season. Good luck. #ThanksShaun
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Hide AdAdendorff will help to bolster a back row division at Saints that also includes the likes of Tom Wood, Jamie Gibson, Lewis Ludlam and Teimana Harrison.
He will help to fill the void left by Mitch Eadie, who is heading back to Bristol Bears this summer.
Adendorff was named on the International Rugby Board's three-man shortlist for the IRB Junior Player of the Year Award 2012 after shining as a blindside flanker for South Africa Under-20s.
He was joined on the shortlist by compatriot Jan Serfontein and former Saints player JJ Hanrahan.
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Hide AdSerfontein eventually won the award after South Africa Under-20s won the thrilling Junior World Championship final at Newlands against New Zealand. It was the first time South Africa had won the competition.
Adendorff has also represented South Africa in sevens.
His club career has seen him play for the likes of Blue Bulls, Boland Cavaliers and the Bulls as well as most recently playing in the second tier of French rugby for an Aurillac side who were sitting third from bottom in the 2019/20 season.