A CELTIC player's trip to Spain has been branded "utterly unacceptable" after he failed to self-isolate upon his return.

Boli Bolingoli played in his team's game against Kilmarnock despite the requirement for anyone returning to the UK from Spain to quarantine for two weeks.

The club has launched an investigation into the matter and Bolingoli has apologised, but Justice Secretary Humza Yousaf said that the Scottish Government has been left "with little choice" but to consider a pause on the sport.

He wrote on Twitter: "Utterly unacceptable from Bolingoli. With a number of incidents, Scot Govt left with little choice but to consider whether pause is now needed in resumption of the game.

READ MORE: Scottish football in jeopardy of early halt after Celtic's Bolingoli ignored rules with Spain jaunt

"Operational matter for Border Force & Police Scot, I support whatever enforcement action they deem necessary."

All 12 Premiership managers and captains held talks with Scottish Government officials on Monday evening where they were reminded of their responsibilities over protocols particular to football and also the general public.

Spain was restored to the Scottish Government's list of countries from which returning travellers must quarantine themselves for 14 days following a decision on July 25, which came into effect from midnight on July 26.

In a statement, the club 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."

The incident is the second time in the past week that players in the Scottish game have been chastised by members of the Scottish Government for not adhering to coronavirus guidance.

On Thursday, First Minister Nicola Sturgeon said she was "furious" with eight Aberdeen players who gathered together in a pub, following which two of the players tested positive for coronavirus and the group had to self-isolate.

As of Monday, 157 cases of the virus had been identified as being part of a coronavirus cluster in the city, leading to Sturgeon imposing restrictions on the council area, including the closing of bars and restaurants.