Celtic chief executive Peter Lawwell has admitted that the club's trip to Dubai last week was "clearly a mistake" after defender Christopher Jullien tested positive for Covid-19.
Following Jullien's positive test, manager Neil Lennon and 13 senior players were forced into self-isolation having come into contact with Jullien during the trip.
Initially, the club defended their decision to travel to the Middle East for training, but Lawwell has now said that travelling during a coronavirus surge was ill-advised.
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"On reflection, looking back and looking with hindsight and looking at the outcome of the trip, clearly it was a mistake and for that I profoundly apologise to our supporters," Lawwell told Celtic's official website.