Portuguese super agent Jorge Mendes says Benfica attacker Anderson Talisca could be a world-beater.
Talisca is a top target for Chelsea boss Jose Mourinho, who is also a client of Mendes.
"Talisca has the potential to become among the best in the world in his role," he said.
"He started the season in spectacular fashion, it was not easy to land in Europe and establish himself within a few months.
"His performance has exceeded expectations early in the season."