Celtic's Boli Bolingoli is facing serious punishment from furious club bosses after flouting strict quarantine rules and taking a secret Spain trip before playing against Kilmarnock on Sunday.

The defender ignored manager Neil Lennon's demands to stick to the training ground, match days and home when he headed to the high-risk country without telling anyone. Then he came off the bench against Killie at Rugby Park after reportedly failing to self-isolate upon his return.

Bolingoli, 25, was - according to the Scottish Sun - hauled into an emergency meeting with chiefs earlier today. The player told the same publication: "I have made a huge mistake. I want to apologise to my Manager, my team mates, the supporters, everyone at Celtic and so many others for letting them down so badly. I am guilty of a major error of judgement. I know what I did was wrong and I know that I must now deal with the consequences."

The club have now launched an internal investigation into the incident. "Celtic Football Club has taken its response to Covid-19 extremely seriously and we are pleased that, to date, we have recorded no positive tests," a spokesman told the Sun.

“Our staff have given so much in this area, working tirelessly to ensure that all players and other club personnel are safe, fully aware of their own responsibilities and familiar with all guidance and protocols. Safety must always be our priority.

“Clearly, a full investigation will now take place and the Club will take all appropriate action. Subsequent to the player’s return he has recorded two negative tests in the past week."

It is understood the incident has enraged First Minister Nicola Sturgeon further after she blasted Aberdeen players for risking the future of this season's Scottish Premiership. It has been claimed there could now potentially be a pause in football due to this most recent blunder from Celtic's left-back.