Scotland wing Duhan van der Merwe and Wales hooker Elliot Dee will start for the Barbarians in Saturday's fixture against South Africa (14:00 BST).
Van der Merwe features in the game against the Springboks before linking up with Gregor Townsend's squad for the Nations Championship.
Dragons hooker Dee, who has won 56 caps, missed out on selection in Steve Tandy's squad for the summer.
The pair are in a Baa-Baas side that is captained by New Zealand scrum-half TJ Perenara and includes Argentina fly-half Tomas Albornoz.
Edinburgh's D'Arcy Rae and Liam McConnell, who are also in Scotland's summer squad, feature along with Munster centre Alex Nakivell.
Van der Merwe features in the game against the Springboks before linking up with Gregor Townsend's squad for the Nations Championship.
Dragons hooker Dee, who has won 56 caps, missed out on selection in Steve Tandy's squad for the summer.
The pair are in a Baa-Baas side that is captained by New Zealand scrum-half TJ Perenara and includes Argentina fly-half Tomas Albornoz.
Edinburgh's D'Arcy Rae and Liam McConnell, who are also in Scotland's summer squad, feature along with Munster centre Alex Nakivell.
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