Celtic defender Boli Bolingoli is the subject of a club probe after going on holiday in secret to Spain and failing to self-isolate on his return.

Strict government rules dictate that anyone who visits the country must self-isolate on their return for two weeks.

Bolingoli jetted off on holiday without telling the club and broke the rules after arriving back in Scotland.

When he arrived back in Scotland the Belgian went straight into training before travelling to and featuring in Sunday's game at Kilmarnock.

Celtic star Boli Bolingoli

Bolingoli came off the bench to replace Greg Taylor in the 1-1 draw.

It's reported he was dragged into a club meeting on Monday to explain his actions and has since recorded two negative Covid-19 tests.

The defender has now apologised for his actions. The 25-year-old said: "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 incident comes after the so-called Aberdeen eight prompted a meeting between the Scottish Government and Pittodrie club chiefs on Monday after the players were forced to self-isolate following a visit to a city centre bar linked to a coronavirus outbreak.

A Celtic spokesman said: "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.

"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."

Celtic legend Chris Sutton slammed Bolingoli and said he should be shown the door at Parkhead,

He tweeted: "There should be no way back for Bolingoli at Celtic now. If he knowingly went to Spain before the Kilmarnock game and broke quarantine rules he showed he really doesn’t give a sh## about his teammates, the manager and the support... Celtic should get rid immediately."

Bolingoli signed for Celtic from Rapid Vienna back in July 2019 before going on to make 28 appearances for the Hoops last season but former Kilmarnock defender Taylor now appears to be Lennon’s preferred option at left-back.