Even before the humiliation in Italy, Carrick was on shaky ground as Manchester United coach, and Como coach Cesc Fabregas had been tipped as a possible replacement.
"I think it's disrespectful to such a great football player and coach as Michael Carrick," said the former Spanish great before the match.
On the pitch, the home team showed no respect for the visitors. Nico Paz scored the opening goal in the third minute. Four minutes into the second half, Tasos Douvikas extended the lead to 2–0 before Argentine Paz added his second goal of the evening eight minutes later.
With just over fifteen minutes left, Jacobo Ramón made it 4–0 with a powerful header. In added time, Joshua Zirkzee scored a consolation goal for the away team.
Manchester United have only won two of eleven matches this season in the Premier League, the League Cup and the Champions League.
Como are making their Champions League debut this season after finishing fourth in Serie A last season.