The Spaniard made an immediate impact after coming off the bench to open his account for Paris Saint-Germain in the second half.
The former Barcelona forward, who started the match on the bench, was summoned by manager Luis Enrique to replace Ousmane Dembele.
The change was part of a decisive tactical reshuffle by the boss, who also withdrew Georgia international Kvicha Kvaratskhelia at half-time as PSG looked to salvage a result from a dismal first half that left them trailing 2-0.
Ferran Torres was introduced alongside fellow substitute Mika Godts. Frank Haise’s side had dominated the opening 45 minutes, establishing their lead through goals from Poland’s Sebastian Szymanski and Esteban Lepaul.
An all-Spanish connection eventually sparked the comeback to make it 2-1. Fabian Ruiz picked out Ferran Torres with a clinical, defence-splitting pass, and the forward showed fine composure to control the ball before drilling a low effort past the keeper, who got a hand to the strike but could not keep it out.
