Scottish Football Association compliance officer Vincent Lunny will on Monday look at footage appearing to show Leigh Griffiths singing an abusive song about former Hearts player Rudi Skacel.
The alleged incident could land the Celtic striker in more trouble with the ruling body and his club.
The 23-year-old former Hibernian player has already been fined by the Parkhead club and faces SFA disciplinary charges after he was filmed singing about administration-hit Hearts' financial problems in a bar before the Edinburgh derby at Tynecastle last Sunday.
On that occasion he was referring to Hearts' financial problems, but the second song - which has been described as 'racist' - Griffiths swears while mocking Skacel's ethnic origin.
Former Czech Republic midfielder Skacel is called a "f***ing refugee" in the song.
Celtic manager Neil Lennon warned Griffiths, who joined the Scottish Premiership champions from Wolves in January, that the Hearts-related transgression was "his one strike".
The Celtic boss added: "I don't want him doing any more - otherwise his career at Celtic won't be as long as he maybe wants it to be."
Griffiths was charged with a breach of disciplinary rule 86, which covers "not acting in the best interests of Association Football".
Fresh footage from the same bar shows Griffiths standing up and dancing about among Hibs fans as they sing the song about Skacel.
Lunny could issue a second charge to the Scotland striker but more likely, the charge will be re-issued taking into account the new footage which would make it a more serious matter.
In 2005, former Hibernian forward Derek Riordan was fined by the Easter Road club and forced to apologise to Skacel when he was filmed singing the same song in a pub with other fans - but that incident pre-dated judicial panel protocol.
Celtic were unavailable for comment.
- Sports & Recreation
- Leigh Griffiths
- Rudi Skacel