Ex-Hibs striker Leigh Griffiths was filmed on a mobile phone singing along with fans before Sunday’s Edinburgh derby.
The 23 year-old, who now plays for Celtic, is seen standing up in a crowded pub before raising his arms and bellowing out “Hearts are going bust” in a clip which lasts 43 seconds.
The footage was recorded by an anonymous Hibs supporter and posted on YouTube.
The clip is believed to have been filmed before Hearts took on Hibs at Tynecastle in a match which the Gorgie side won 2 - 0.
The win meant Hearts, who sit bottom of the table on nine points, escaped relegation at the hands of their city rivals.
St Mirren sit 21 points clear of Hearts who have seven games left to play.
Leigh Griffiths signed for Celtic from Wolves in the January transfer window for a fee of around £1m.
He had previously spent two season on loan at Hibs.