Macaulay McGowan was heard asking his corner for an update on the Manchester derby score during his fight against Kieron Conway on Saturday night.
The Manchester-born super welterweight was defeated by Conway on the undercard of Anthony Joshua vs Kubrat Pulev.
He suffered a double hammer blow with his fight coming at the same time as Pep Guardiola's men faced Ole Gunnar Solskjaer's side, meaning he was unable to watch the encounter.
McGowan had fallen behind in the fight at the end of round six, but struggled not to be distracted by events at Old Trafford.