That's according to talkSPORT host Tony Cascarino, who gave his backing to Fernandes after the midfielder was widely criticised for his comments about the 18-year-old.
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The Portugal international was accused of 'digging out' Garnacho live on TV after another impressive display from the Argentine wonderkid.
Garnacho scored the only goal, the winner and his first for the club at senior level, to guide United to a 1-0 win over Real Sociedad in the Europa League.
However, after the match Fernandes spoke about the youngster's poor attitude at the start of the campaign, revealing that his behaviour during pre-season is why we're only getting glimpses of his talent now.
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talkSPORT pundit Dean Saunders was not happy, saying it was completely unnecessary for Fernandes to dig out the teen in that moment, and admitting he has 'lost respect' for the midfielder as a leader.
But former Chelsea striker Cascarino insists Fernandes was right, claiming Manchester United can't see another promising young talent end up 'lost' due to their poor attitude.
"If you're a bit wild and you think you're entitled to a place in the team, you might be good enough, but you have to be told," said the Weekend Sports Breakfast host.
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"Ravel Morrison was one of the best youngsters I've ever seen, but he didn't listen enough. He didn't take things on board.
"I saw Ravel Morrison do things in games not many people can do, but he was a great Manchester United product who ended up losing his way.
"You can easily do that if you don't listen… so was Fernandes right to call him out? Yeah!
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"At that age you can't get ahead of yourself. Kids need to learn.
"I think there's no problem calling Garnacho out, because if he listens and he matures and he keeps doing what he can do, he's going to be one hell of a player.
"He's got the lot."
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Saunders accused Fernandes of tarring Garnacho with the 'bad attitude' brush, which he claims will now stick with the player.
But former Arsenal and Everton striker Kevin Campbell insists what Fernandes said was actually a positive thing, with the vice-captain saying he is a brilliant footballer, his poor attitude is a thing of the past and this is what happens when you stay disciplined.
"I actually think it was the right thing to say," he told the talkSPORT Breakfast on Friday.
"If a young player's attitude is not right… it's very difficult for a young player to understand what it takes to be a first-team player, so when you do go on pre-season the first-team squad see who they are going to accept into the group.
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"And if the attitude isn't right, they're not going to be accepted.
"I believe this young man is a very talented player, and he should have really been knocking on the door and being involved a lot earlier.
"So I think what Fernandes is saying right now is he's got his attitude right and this is what happens when you have that attitude and when you do have focus - you get in the team and you produce performances like that.
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"I don't think Bruno is speaking out of turn here. He's probably done it on the training pitch before and that's what's helped him get to where he is.
"Why not tell the truth? Your attitude now has actually got you, when it had hindered you at the start.
"Yes, his attitude might not have been right, but he's rectified it because look at him now."