It was learned that Fernandes has agreed a contract worth around £130,000-a-week with the Old Trafford side.
Sportsmail claims that United will be offering £50million plus £10m in add-ons to sign Fernandes in the January window, and this could be enough to push through his move.
Fernandes, who began his professional career at Novara in Italy before spells at Udinese and Sampdoria, is now likely to call time on his three-year spell at Sporting in favour of a move to United.
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The Maia-born central midfielder then joined Sporting in 2017 and has gone on to make 81 league appearances for them, scoring 39 goals. Fernandes is likely to bid farewell to Sporting Lisbon in their derby against Benfica on Friday evening ahead of his move to United.