The 19-year-old, who had already come close with a curling strike in the first half, rifled a sensational drive into the top far corner after 67 minutes to give Mourinho’s men a precious away goal.
Mourinho, speaking after the game, noted that the Englishman remains at Carrington for 30 minutes after training finishes to practice free kicks.
And the 54-year-old, when asked about Rashford, further noted that plenty of work had gone into that moment of brilliance in Galicia.
“Marcus worked really hard and caused them problems,” he said.
“The free-kick is his work. He loves to work.
“Sometimes the training is finished with the group, and he keeps individual work with my assistant. The free-kick is really well taken, and I think the goalkeeper has no chance with it.
“He is a kid that finishes a training session and stays half an hour more every day to take free-kicks and to wait for the opportunity.
“He trains a lot. He trains, and practises, he enjoys the extra work. Zlatan is not here. That position is not Paul Pogba’s favourite position, so he [Rashford] took it.
“It’s a great fee-kick because the ball moves really, really fast, and I think with the speed of the ball it’s impossible to save.”
You might remember Paul Scholes, soon after Rashford broke into the first team, noting that the teenager hits free-kicks with a similar style to Cristiano Ronaldo, pointing towards the way both place emphasis on getting the ball to dip.
His strike against Celta could not have been a better case in point. Everything about the free kick was perfect: Daley Blind‘s decoy run, Marouane Fellaini‘s subtle blocking of Sergio Alvarez’s vision, and then the strike – swerving, dipping, somehow accelerating and moving away even more as it travelled – seamlessly flying past the keeper’s right hand.
Balaidos fell silent, stunned by what had just happened – a moment of pure greatness from a player who has never dropped in his level of commitment this season.