International players are dotted throughout the side, with former French winger Ugo Mola teaming up with Italian Christian Stoica in a dangerous-looking backline. The multi-talented Laurent Marticorena lines up at fullback and French international Alexandre Albouy gets the nod at scrum-half.
The side will be captained by powerful lock David Barrier and also includes Argentinian international prop Mauricio Reggiardo and Uruguayan backrower Rodrigo Capo, while South African prop Brent Moyle and Moroccan hooker Djalil Narjissi are on the bench.
Caerphilly coach Mark Ring has named one of his strongest possible lineups in recent months as players return from injury.
All eyes will be on play-making fly-half Justin Thomas, while Joe El-Abd makes a welcome return to the backrow.
Reserve prop Robert Bilton will get a special mention if he takes part in the match – at 44, he would be easily the oldest participant in a European rugby final.
CAERPHILLY: F Tuipulotu; R Howells, R Higgett, R Boobyer, T Taufahema; J Thomas, A Chilten; L Manning, C Ferris (capt), D Sweet, D Davies, P Jones, G Jones, M Workman, J El-Abd.
Replacements: L Richards, G Lewis, R Bilton, G Liddon, F Vunipola, N Watkins, S Grainger.
CASTRES OLYMPIQUE: L Marticorena; U Mola, S Roque, A Stoica, L Arbo; R Teulet, A Albouy; M Reggiardo, R Vigneaux, J Garcia, D Barrier (capt), N Spanghero, R Froment, R Capo, G Taussac.
Replacements: J Narjissi, B Moyle, P Furet, J-M Bisaro, N Nadau, N Raffault, M Sans.
