Pep Guardiola’s men strolled to a comfortable 3-1 victory over their neighbours before the international break, leaving United languishing eighth in the Premier League table behind Bournemouth and Watford.
The Red Devils welcome struggling Crystal Palace to Old Trafford this weekend and Mourinho has already begun his preparations for the must-win fixture.
The Portuguese was pictured wearing a red woolly hat and black snood during Tuesday’s session, which saw the players not involved in international football put through their paces.
Anthony Martial, who was forced to withdraw from the France squad with an abductor injury, appeared to have fully recovered from the problem as he trained alongside his team-mates.
The Frenchman was joined by Spanish duo Juan Mata and Ander Herrera, summer signing Fred, and defenders Phil Jones, Chris Smalling and Ashley Young.
Jones was seen laughing during one sprint, while Martial posed with Diogo Dalot and Marouane Fellaini showed his new hairstyle on a chilly morning in Greater Manchester.
Many of the squad were also treated to a visit from pop sensation Anne-Marie, who posed for photos with Jones, Mata, Martial and coach Emilio Alvarez.