"I see a great improvement in the person, in the moods, in the face and body language", Mourinho told reporters today.
But the France worldwide was far less impressive last term, scoring just eight goals in all competitions as off-field matters reportedly took their toll.
Speaking ahead of Saturday afternoon's Premier League clash with Southampton, via FourFourTwo, Mourinho took the time to praise the quality of the attacking players in his squad - who have contributed to the club scoring 16 goals in their first five games of the campaign.
"He's a happy guy, he's working extremely well", the Portuguese tactician reiterated. I am very pleased with his attitude overall, which means it's easier [for him] to play well.
Southampton have lost 10 Premier League games in 2017 so far - if they lose this match, they'll have already equalled their tally of Premier League losses in 2016 (11) with 15 more games scheduled to play following this fixture this calendar year.
The League Cup is less prestigious than the other three major trophies available to United this season, but Mourinho was happy to benefit from it last term when it became his first piece of significant silverware at the club.
"Where the connection between the players the fans, and the team looks stronger and stronger".
Admittedly, they were playing against Championship Burton, but you can only beat what's in front of you.
"After a long period of time without playing a game he is training well".
Pellegrini's side sit ninth in the Premier League table after five games and they appear to have come through a hard period, yet the last team they will want to face now is United.
While Louis van Gaal had decent players, his football was sideways and backwards as his "philosophy" sent Old Trafford to sleep. I'm not going to cry or count the days for him to be back'.
"Martial was good, (Juan) Mata was good, (Jesse) Lingard was good".
The pair have been duelling it out for the left-wing spot following the arrival of centre-forward Romelu Lukaku and Rashford says they are driving each other on.