Fernandes wants to play in England one day but is not itching for a move this summer.
He has garnered mass interest, though, following a Primeira Liga campaign in which he scored 20 goals and laid on 13 assists.
Although United face competition from their fiercest rivals – Liverpool and City – they are best placed to sign Fernandes, according to Italian media outlet Radio Rossonera.
“Patience is required,” though, reported Pietro Balzano Prota of the agency.
United, unlike their English competitors, cannot offer Champions League football next campaign but Ole Gunnar Solskjaer is keen to acquire young, malleable talent to form the side around.
Fernandes, who helped Portugal to their UEFA Nations League triumph on Sunday, spoke recently about the allure of the Premier League.
“Of course it is possible to continue in Sporting,” the midfielder told Portuguese station Radio Renascenca.
“I do not know what the truth of what has been in the newspapers is.
“I will have time now to know this, but I’m good at Sporting.
“I never said that I want to leave, but there are dreams that I would like to fulfil and one of them is to play in England.
“It is not now the English clubs and interested parties appear that I say this. It was always a dream.
“I’m good at Sporting, I do not think about leaving but there are clubs and proposals that cannot be rejected.
“I will only do this if Sporting agrees with me.”
Fernandes’ contract runs until June 2023 and is reportedly valued at £70million.
The spindly playmaker played for plied his trade in Italy for five years at Novara, Udinese and Sampdoria before sealing a move to Sporting in 2017.