Ian Madigan and recently retired Mike Ross are among the names added to the Barbarians’ 27-man squad for the upcoming games against Ulster Rugby and England.
Head coach Vern Cotter will have a group with 1,018 international appearances between them at his disposal for the challenge against England at Twickenham Stadium on Sunday 28 May before heading to Belfast to take on Ulster at Kingspan Stadium on Thursday 1 June.
Madigan, who will join Pat Lam at Bristol in the Premiership season after a single season with Bordeaux Begles, will add to the backline options that already includes the likes of Adam Ashley-Cooper, Yann David, Frans Steyn, Kahn Fotuali'i and departing Ulster half-back Ruan Pienaar.
Ross meanwhile is set for his final outing in a professional environment.
The 37-year-old Leinster forward won 61 caps for Ireland in a Test career that began in 2009, and is one of a number of additions in the forwards, along with two-time World Cup winning prop Ben Franks and Welsh hooker Richard Hibbard.
The Barbarians' match against Ulster is the first time the sides have met since 1957, but the club enjoyed a successful visit to Belfast last November when they beat Fiji 40-7.
Backs: Horacio Agulla (Castres & Argentina), Adam Ashley-Cooper (Bordeaux Begles & Australia), Yann David (Toulouse and France), Kahn Fotuali'i (Bath Rugby & Samoa), Robbie Freuan (Bath Rugby), Rory Kockott (Castres & France), Ian Madigan (Bordeaux Begles & Ireland), Timoci Nagusa (Montpellier & Fiji), Waisea Nayacalavu (Stade Francais & Fiji), Ruan Pienaar (Ulster & South Africa), David Smith (Castres), Frans Steyn (Montpellier & South Africa).
Forwards: Patricio Albacete (Toulouse & Argentina), Steffon Armitage (Pau & England), Schalk Brits (Saracens & South Africa), Thierry Dusautoir (Toulouse & France), Corey Flynn (Star RFC & New Zealand), Ben Franks (London Irish & New Zealand), Gillian Galan (Toulouse), Richard Hibbard (Gloucester & Wales), Facundo Isa (Lyon & Argentina), Census Johnston (Toulouse & Samoa), Mikheil Nariashvili (Montpellier & Georgia), WP Nel (Edinburgh & Scotland), Mike Ross (Leinster & Ireland), Joe Tekori (Toulouse & Samoa), Jeremy Thrush (Gloucester & New Zealand).