BBC News
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Rangers has challenged the validity of a video which appears to show an anti-Catholic chant at an event with players at Ibrox.
Police Scotland said it is examining social media footage which is claimed to show sectarian singing in a lounge at the stadium on Saturday.
Rangers said they were concerned that an "attempt to discredit players" had been "taken as genuine".
The club had just won their first Scottish Premiership title in a decade.
Justice Secretary Humza Yousaf told the BBC he was "disgusted" and said if the footage was genuine then those involved should be "booted out of the club".