The Portuguese attacking midfielder has shown his quality, scoring and assisting in most of his initial appearances since arriving at Old Trafford from Sporting in January.
But Silas believes that Fernandes still has a lot more to offer the Red Devils as he settles into the team and league.
"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."