The Red Devils star put in a superb performance as his team won 4-0 against Real Sociedad in the Europa League round of 32 first leg clash.
Fernandes scored the first two goals and was United's main source of creativity.
"He's been sensational from the day he signed, he makes the team play football," Scholes told BT Sport.
"Every single time he plays, he affects the game. He's been a truly, truly terrific signing.
"He was almost playing as No 9 tonight, the amount of times he was spinning in behind and running through.
"It was a great pass from Marcus (Rashford - for the first goal) and a great run. It was very clever play from Fernandes, he realises no one is in control of it and he's there to pick up the pieces. There's almost ice running through his veins when he's got a chance to score."