Carreras called up by Argentina
The 21-year-old, who recently signed an contract extension to remain at Kingston Park for next season, has already represented Argentina at 7s and Under-20s levels.
But he could now step up into the full test arena as they prepare to take on Wales on Saturday, having defeated Romania 24-17 last weekend.
The 1pm kick-off in Cardiff is being shown live in the UK on BBC TV and S4C.
