The Portuguese drew criticism from supporters for going missing in the goalless draw at Anfield.
But club legend Ferdinand insists the 26-year-old has been 'phenomenal' all season for the Red Devils.
"They looked off but we're top of the league so I always look at it like that," Ferdinand said on Stretford Paddock in response to questions about the performances of Fernandes and Marcus Rashford. "Yeah, there might be players off form, but if you're still nicking results and you're still winning and you're still in a healthy position, that's not a bad thing.
"If we played this game and had zero shots on target and we looked like we had no threat at all, then I'd be a little bit concerned.
"But, listen, you can't talk about [Bruno]. I wouldn't say Bruno's looked off recently. The geezer's output has been phenomenal."