Scotland are in the second-tier Trophy after finishing last in the 2019 Junior World Championship - the last time the competition was played before Covid forced a three year break.
The winner of the World Trophy will secure promotion to the top tier Junior World Championship in 2024.
The match will kick-off at 8.00pm at the Ruta de la Plata Stadium in Zamora. Scotland's starting XV will be announced on Friday.
Squad:
Forwards: Robbie Deans, Oliver Minnis, Craig Davidson, Callum Norrie, Max Surry, Corey Tait, Jerry Blyth-Lafferty, Finn Duraj, Jake Parkinson, Eddie Erskine, Ruaraidh Hart, Jake Spurway, Jonny Morris, Liam McConnell, Jonny Smith.
Backs: Finlay Burgess, Ben Afshar, Richie Simpson, Ben Salmon, Fin Thomson, Kerr Yule, Geordie Gwynn, Kerr Johnston, Finn Douglas, Dan King, Andrew McLean.