Celtic have blasted Boli Bolingoli's "stupidity" and apologised to the SPFL for his "irresponsible action" after the player breached quarantine restrictions.
Bolingoli travelled to Spain without the club's knowledge and did not follow quarantine rules when returning from the country.
He then featured in Celtic's 1-1 draw against Kilmarnock on Sunday, with his indiscretion coming after two Aberdeen players had tested positive for coronavirus.
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Eight Aberdeen players issued an apology for breaking guidelines by visiting a bar in the aftermath of their opening-weekend defeat to Rangers.