The Portugal international continues to be linked with a move to the 20-time English champions, although it is thought that Sporting are not prepared to sell him before Friday's league clash with Benfica.
According to A Bola, Fernandes could be in the stands for Sunday's league match between the bitter rivals at Anfield as he closes in on a move to Ole Gunnar Solskjaer's side.
The Red Devils were strongly linked with the 25-year-old during the summer transfer window but were unable to agree a fee with Sporting, who are currently fourth in their domestic table.
The attacking midfielder has been in impressive form at club level during the 2019-20 campaign, scoring 15 times and contributing 13 assists in 25 appearances in all competitions.
United are the only team to have taken points off Liverpool in the Premier League this season.