Juan Martin Fernandez Lobbe will mark the final game of his outstanding rugby career by captaining the Barbarians in Sunday's clash against England at Twickenham.
The 36-year-old has won 71 Test caps, played in three World Cups and enjoyed European and domestic title successes with French club Toulon.
The Barbarians' starting line-up will be announced on Friday.
Head coach Pat Lam will select from a squad that includes the likes of England international wing Chris Ashton, Scotland half-backs Finn Russell and Greig Laidlaw and Wales flanker Justin Tipuric.
Fernandez Lobbe had a three-year spell in the Premiership with Sale Sharks before joining Toulon in 2009.
He carved a reputation as a world-class back-row forward, performing with enviable consistency for club and country.
In a statement released by the Barbarians, Fernandez Lobbe said: "It's a real honour to lead the Barbarians.
"Since I was a kid I've been watching them play, and to me they represent the purest values of rugby.
"Playing England is a massive challenge as they are a top nation, but we have the sort of players here who love that kind of challenge.
"It's my last game ever, but I'm OK and at peace.
"I've been thinking about it for a long time, and this last year I've enjoyed every minute."
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