Grêmio defeated Sportivo Luqueño 2-1 in their Copa Sudamericana debut.
During the closing moments, Grêmio's striker, Braithwaite, suffered an ankle sprain after an awkward landing. He scored the winning goal, and his return from a previous adductor injury was short-lived.
Grêmio faces Ceará on Saturday and Atlético Grau-PER in the Copa Sudamericana next Tuesday. Braithwaite's availability is uncertain.
Coach Gustavo Quinteros confirmed the ankle sprain and stated that Braithwaite will undergo further assessment in Porto Alegre.