To make sure you never miss out on your favourite NEW stories, we're happy to send you some reminders
Click 'OK' then 'Allow' to enable notifications
Featured Image Credit: Image: PA & Sky Sports
An 18-year-old Rooney joined United from boyhood club Everton on deadline day in 2004 in a £26 million move.
There was huge pressure on the youngster given the price tag but he had already demonstrated his quality on the big stage with a slew of sublime displays for England at Euro 2004.
And having played in the same team as him at England, Neville had a strong incline that Rooney was going to achieve big things at United.
With Van Nistelrooy, Neville hadn't seen much of the Dutchman but he was quickly left in awe when he saw him during shooting drills after signing from PSV Eindhoven.
"There were two certainties," Neville said on a transfer special on Sky Sports.
"The one who I already knew was Wayne Rooney. It wasn't even a risk, you just knew he would be absolutely unbelievable.
“Even though we had to wait for him to make his debut because he was injured, I never thought it would be a risk.
The other one I didn't know but we spent a lot of money on him and it was Ruud van Nistelrooy.
“The first time I watched him in training, he did a shooting session and hit one and I went, ‘woah, you can't kick a ball like that’.
“Sometimes you see things in training and just think to yourself, ‘that's a proper player’.
“That was Ruud. He was the one who I didn't know beforehand that I looked at straightaway in training and thought he was unbelievable.”
Van Nistelrooy, who joined in 2001 after the move was put off for a year following the striker suffering an ACL injury.
But that didn't derail him in the slightest as Van Nistelrooy proceeded to bang in 150 goals in 219 games as he established himself as one of the deadliest finishers in the game.
Meanwhile Rooney spent 13 glorious years at United, winning five Premier League trophies and becoming the club's all-time record goalscorer with a ridiculous 253 goals.
Neville was indeed right about both players but did also name Juan Sebastian Veron and Diego Forlan as two players whose shortcomings at Old Trafford he could not have predicted.
The South American pair had good careers overall but never quite cut it at United.