Mourinho said on the United website: “17 years… in Leiria, Porto, London, Milan, Madrid, London again and Manchester. Training, playing, travelling, studying, laughing and also a few tears of happiness.
“17 years and the kid is now a man. The intelligent student is now a football expert, ready for a successful career as a manager.”
Faria has been mentioned in some reports as a possible contender to succeed Arsene Wenger as Arsenal manager.
Mourinho added: “I will miss my friend and that is the hardest thing for me, but his happiness is more important and, of course, I respect his decision, especially because I know that we will always be together. Be happy, brother.”
#MUFC announces that assistant manager Rui Faria is to leave the club at the end of the season. We wish him all the best for the future.
— Manchester United (@ManUtd) May 12, 2018
Faria said: “After a lot of consideration, and with a very heavy heart, I have decided the time is right for me to move on. I have had 17 years of incredible and unforgettable experiences.
“However, I have felt for some time that I would like to spend much more quality time with my family before pursuing any new challenge in my professional life.
“My heartfelt thanks go to the manager, Jose Mourinho, for the belief he had in me, all those years ago, when it all was just a student dream. I would like to thank him for the opportunity and confidence, for the knowledge and experience, but most importantly for his friendship.
“I would also like to thank Manchester United and all the clubs where I have had the privilege of working during this period.
“I would like to say a big ‘thank you’ to all the staff and players who, in different ways, have made an important contribution to my growth as a person and as a professional.
“I wish you all the best for the future, knowing that you will always be my close friends.”
Lukaku is struggling with an ankle injury sustained against Arsenal last month and is to miss the climax to the Premier League campaign against Watford at Old Trafford on Sunday.
The Belgium striker is also a doubt for the Wembley showpiece against Chelsea on May 19, but Mourinho hopes he will be involved in some capacity.
“We hope he can play the final,” the United manager said.
“He’s in Belgium having his treatment and there is communication between the doctors in Belgium and our medical department.
“We are just waiting to see if it’s possible for him to be involved in the final, if not starting at least he can be on the bench.”
Michael Carrick will captain United on Sunday to mark the England midfielder’s final appearance before joining Mourinho’s backroom staff.
“Carrick had already been decided. So if we’d lost the match (against West Ham) and we needed the point against Watford, I would play Carrick the same,” said Mourinho.
“He’s going to start the match as a captain and he’s not going to end the match because I want him to leave the pitch alone and I want him to feel what the United supporters feel in relation to him.
“I am not so sad as I normally am when my players end their career because he is going to be with us.
“He is going to be even closer to me than he was as a player so it is just an emotional moment because it is the end of a career of a fantastic player.
“So he starts the match and we make the change in some moment so he can leave the pitch alone.”
Mourinho will not field a young team against Watford, even though United are assured of second place behind champions Manchester City regardless of what unfolds on Sunday.
“I have every player apart from Marouane Fellaini and Lukaku available and I don’t go to the young players,” he said.
Hello, Denzil Pinto here with everything you need to know in the world of sport …
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Good start to the tournament. Thanks all for the support. Great to play at home with this amazing crowds. pic.twitter.com/N7B2G2GiDH— Rafa Nadal (@RafaelNadal) May 9, 2018
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