The Barbarians have revealed five more players, headlined by All Blacks utility back Luke McAlister, to represent them against England on May 30 and Australia on June 6.
McAlister is joined in the latest batch of invitees by former Wallaby Justin Harrison, New Zealand's greatest ever try-scorer Doug Howlett, Samoan centre Seilala Mapusua and All Blacks five-eighth Nick Evans.
The Barbarians have already confirmed that Rocky Elsom, Jerry Collins, Justin Marshall and Sonny Bill Williams will all feature in the historic clash.
The Barbarians have now named more than half of their squad and are due to add another 11 players before they meet the Wallabies.
Barbarians squad so far: Luke McAlister (New Zealand), Doug Howlett (New Zealand), Sonny Bill Williams (uncapped), Seilala Mapusua (Samoa), Justin Marshall (New Zealand), Nick Evans (New Zealand), Rocky Elsom (Australia), Martin Corry (England), Sebastien Bruno (France), Jerry Collins (New Zealand), Justin Harrison (Australia), Serge Betsen (France).
England Under-18 head coach John Fletcher insists his young side will be better for the experience after beating Italy in the bronze final to round out their 2015 Rugby Europe U18 Championship campaign in style.