Vermeulen, who reported for duty briefly at the team’s training camp in Bloemfontein in June, has been undergoing rehabilitation following surgery several weeks ago.
However, his steady progress proved to be sufficient for Vermeulen to be called up to the squad that drew the Castle Lager Lions Series one-all with a convincing 27-9 victory on Saturday.
“Duane will join us on Sunday and will be medically assessed as soon as possible,” said Springbok coach Jacques Nienaber.
“We will never risk a player who is not 100% fit but he brings experience to the squad and it will be great to have him with us.”
Nienaber added that the Boks will know more about Pieter-Steph du Toit’s injury on Monday.