Uncapped Wasps flanker Sam Jones is among the latest additions to a strong Barbarians squad for their games against England and the British and Irish Lions.
The Baa-Baas have now confirmed 22 players who will form the nucleus of their tour party.
Former England Under-20 forward Jones will be joined in the squad by his Wasps colleague Marco Wentzel, while other additions include Perpignan-based Wales international back James Hook and fellow Welshmen Dwayne Peel and Matthew Rees.
"Our selection process has taken several months and is still not quite complete," Barbarians team manager Derek Quinnell said.
"Over the next week or so we will be monitoring the domestic play-off matches in Europe and the various national squads for the summer tours.
"Also, one or two players in the squad announced today may not be available for both of our matches, so we expect to add other significant names in the near future."
Squad: Backs - J Payne (Ulster), R Varty (DeA Tigers and Hong Kong), T Ngwenya (Biarritz and USA), J Rokocoko (Bayonne and New Zealand), J Hook (Perpignan and Wales), N Evans (Harlequins and New Zealand), K Fotuali'I (Ospreys and Samoa), D Peel (Sale Sharks and Wales), D Yachvili (Biarritz and France).
Forwards - D Jones (Ospreys and Wales), B J Botha (Munster and South Africa), P James (Bath and Wales), M Castrogiovanni (Leicester and Italy), M Rees (Scarlets and Wales), L Ghiraldini (Treviso and Italy), M Wentzel (Wasps and South Africa), J Hamilton (Gloucester and Scotland), F Louw (Bath and South Africa), S Jones (Wasps), A Zanni (Treviso and Italy), S Parisse (Stade Francais and Italy), I Harinordoquy (Biarritz and France).