"When you play with Michael Carrick you think there is authority, control, peace".
Anthony Martial has slipped swiftly down the pecking order at United this season but had been named by Mourinho as a likely starter here.
The 36-year-old had other options as he approached the end of his playing career but the chance to work under Mourinho was too good to refuse.
Faria, like Mourinho, never played top-level football, but became a significant part of his fellow Portuguese's coaching staff after meeting the future United manager during a seminar day at Barcelona's Camp Nou stadium in 2000.
I'm going to have assistant coaches, I'm going to have fitness coaches, and a structure where they have specialists in different areas connected to the performance. "I am going to jump on the staff", he said.
But it could only be a temporary departure from the normal management set up.
With just one La Liga game and the UEFA Champions League final against Liverpool pending, Real Madrid's season is all but over and it hasn't gone quite as well as Florentino Perez and Zinedine Zidane would've liked.
Faria has been assistant manager at Old Trafford since Mourinho took over two years ago, having first worked with his fellow countryman 17 years ago at the Portugese club Uniao Leiria.
"It's not a sad goodbye by any means, I've got a lot to look forward to", said Carrick.
"I always think that in the championship the truth is always there". And I've been at this great club as a player so I know the club.
"The moment he's my assistant he will help in every aspect". Participating in the process means participating in every aspect. The French defender looking to become one of the best paid players at the club. I am sure he will teach me a few things and we will have some success in the near future, I am certain of that.
The United manager will employ some new faces also for his reconstructed backroom team.
'However simply because I used to be a half-decent participant, it would not assure you are going to be a hit in no matter you do.