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 .