Forest had controlled the opening half with Igor Jesus scoring twice – his first in the 14th minute when he fired in at the far post after a ball rebounded into his path and the second just before the break after a flowing move.

There was no hint of the drama to come for most of the second half on a rainy south Wales night but Swansea got a lifeline with just over 20 minutes remaining as Cameron Burgess found space to head in from a corner.

Slovenian substitute Zan Vipotnik then levelled in the third minute of stoppage time and Forest could not even get to a penalty shoot-out as Burgess pounced after Ethan Galbraith’s piledriver came back off the woodwork.

Postecoglou’s side have now conceded six goals in his two games after his Forest reign began with a 3-0 defeat at Arsenal in the Premier League on Saturday.