Bielsa gave United's players a day off for a Festive celebration due to the lack of opportunity presented by the upcoming fixture list over Christmas and new year.
Phillips suffered a small cut after grazing his eye on a wall but was checked out by Whites staff and has trained as normal ahead of United's next Premier League assignment at Brighton.
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National media reports claim United's players were at popular London nightclub Cirque Le Soir when Phillips suffered the minor injury.
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Thank you Laura Collins