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Fernandes has injected a much-needed creative spark into Ole Gunnar Solskjaer's team since swapping the Jose Alvalade Stadium for Old Trafford in January.
The playmaker has already begun to pay back the EUR55 million (?48m/$61m) United invested in his talents, contributing three goals and two assists in his opening six appearances.
Fernandes' superb 25-yard strike earned the Red Devils a 1-1 draw at Everton, which keeps them in the hunt for a top-four finish come May.
Silas witnessed the 25-year-old's abilities up close at Sporting, and says United supporters have only seen a glimpse of his immense potential so far.
"Was there any doubt that Bruno Fernandes was going to arrive at Manchester United and be what he is? He will do more," Silas told Portuguese publication Record.
"Imagine in a few months, when he is more integrated. I saw him training every day, honestly, I've never seen a player like Bruno, who spent an hour practising shots after training.
"I had to say 'Bruno, that's enough'. When he goes to a team like that, which is also good, it's normal. He's very outgoing, can adapt easily."
Solskjaer was full of praise for Fernandes after the stalemate against Everton, admitting he has given the whole club a "big boost" heading into the business end of the season.
The former Sporting talisman was not completely satisfied with his latest performance, however, insisting "he can do much better" in the final third of the pitch.
He will likely be given another chance to shine when United travel to Pride Park to face Derby in the fifth round of the FA Cup on Thursday.
Solskjaer will then start preparing his side for a crucial derby clash, with Manchester City set to arrive at Old Trafford three days later.
The Red Devils must beat their arch-rivals to keep the pressure on fourth-placed Chelsea, who still hold a three-point lead in the final Champions League spot with just 10 matches of the 2019-20 campaign remaining.