Rory Best will captain the Barbarians against Fiji in Saturday's clash at Twickenham.
Former Ireland and Ulster skipper Best, 37, has been given the armband by Barbarians coach Eddie Jones for the first of a three-game series.
Best earned his 124th and final Ireland cap in the World Cup quarter-final defeat by New Zealand on 19 October.
He also played 218 provincial games for Ulster and made nine Lions appearances during a 14-year career.
The Barbarians squad also includes three of South Africa's World Cup-winning side; Tendai Mtawarira, Makazole Mapimpi and Lukhanyo Am.
Jones' side will face Brazil and Wales after taking on Fiji.
Barbarians: David Havili, Dillyn Leyds, Mathieu Bastareaud, Andre Esterhuizen, Makazole Mapimpi, Curwin Bosch, Joe Powell; Tendai Mtawarira, Rory Best, Enrique Pieretto, Luke Jones, Tyler Ardron, Pete Samu, Marco van Staden, Josh Strauss.
Replacements: Andrew Makalio, Campese Ma'afu, Hencus van Wyk, Angus Cottrell, Matt Philip, Jano Vermaak, Lukhanyo Am, Morne Steyn.