Mourinho appeared to be showing Jesse Lingard how to play the perfect pass at the Nad Al Sheba complex, though the in-form forward looked a little bemused to say the least.
The squad stepped up their intensity in the pleasant Dubai sunshine, working on their ball control as well as the finer tactical points during the lengthy session on Wednesday.
And the United stars appeared to respond well as they prepare for the second half of the season during which they will compete on three fronts.
While catching and overtaking runaway league leaders Manchester City – who currently enjoy a 15-point lead at the top – appears unlikely, United are still in two cup competitions.
They travel to Yeovil Town in the fourth round of the FA Cup and will take on Sevilla in the last 16 of the Champions League.
Antonio Valencia and Michael Carrick again took part in a full training session as they return from injuries, a boost ahead of their next assignment against Stoke City on Monday evening.
The break, owing to United’s exit to Bristol City in the last round of the Carabao Cup, is the perfect opportunity for Mourinho to work on tactics and strategy having just come through the hectic festive fixtures.
It certainly looked more intense than the light-hearted training session they took part in on Tuesday.
United took only three points from a possible nine in their first three Christmas games, but have since recovered to win 2-0 at Everton and beat Derby County 2-0 in the third round of the FA Cup.
And that seemed to have restored the smile to Mourinho’s face, even though his initial impression of Dubai wasn’t so positive when confronted with pouring rain on Monday.