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They've just returned from a training camp in Dubai.
Celtic will fulfil their Scottish Premiership fixture against Hibs this evening - despite being without 14 first team players and manager Neil Lennon because of coronavirus.
Christopher Jullien is the only member of the group to have tested positive for Covid-19 on his return from the winter training camp to Dubai.
But the other 13 players and the Celtic management team are considered close contacts so have to quarantine.