Sergio Parisse, Martin Castrogiovanni, Kahn Fotuali'i, Jaque Fourie and Imanol Harinordoquy will all play for the Barbarians this season.
The invitational side announced the first five names of their squad on Tuesday that will play the British & Irish Lions in Hong Kong and also against England at Twickenham.
Fotuali'i, hailed as one of the most exciting players in world rugby by the Barbarians, will turn out for the invitational side ahead of his move to Northampton Saints from the Ospreys.
Parisse, Harinordoquy and Castrogiovanni will all offer great Test experience in the pack, whilst 2007 Rugby World Cup winner Jaque Fourie will return to the international scene after playing in Japan.
More names are set to be added to the Barbarians squad in the coming weeks.