The defender nodded home in the 43rd minute after Ajdin Hrustic's searching cross picked him out at the back post.

It maintained the Socceroos' perfect qualifying record on the road to Qatar 2022.

Grant was an unlikely match-winner, opening his account on the occasion of his 14th cap with what proved to be the visitors' only shot on target at an empty My Dinh Stadium.

Despite appearing a little shot-shy on this outing, Graham Arnold's men have scored 32 goals in their winning streak, while Tuesday's clean sheet means they have conceded only twice.

Arnold's men resume their qualifying campaign with games against Oman and Japan next month.