Tuanzebe yesterday put pen to paper on a new deal with the Red Devils, committing his future until 2020 with the option of an extra year.
The 19-year-old made his first-team debut against Wigan last Sunday having risen through the ranks at the club's academy.
Marcus Rashford is another youngster to emerge from the youth system, who has established himself as a regular first-team player since last season.
And Butt believes the duo are setting a fine example to younger players of how it should be done.
Nicky Butt only had kind words to say about Marcus Rashford and Axel Tuanzebe
Man United stars bring out 4x4s to tackle farm track to and from training
Thu, February 2, 2017
Manchester United stars were forced to roll out their fleet of off-road vehicles as they made their way to and from training down a dirty farm track
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Manchester United stars are forced to take a farm track to and from training
He [Tuanzebe] is the perfect example to all our Academy players – as is Marcus Rashford as well.
"Axel is simply one of those boys you just trust," Butt told the club's website.
"Whatever he does, when he goes on the pitch, when he is in training, when he goes home, when he's in front of the press… you trust him. He is the perfect example to all our Academy players – as is Marcus Rashford as well.
"They're the kind of players we want to bring to this club through the Academy. We want them to be with our club for five, 10, 15 years and be the leaders at United and show the next group of youngsters how they should do things.
Rashford has been one of Manchester United's biggest success stories from the academy recently
Axel Tuanzebe signed a new long-term deal with Manchester United yesterday
"It's amazing really when you think one of the biggest, probably the biggest club in the world, still gives youngsters platforms.
"It shows that if you're good enough, you'll get your chance no matter who the manager brings in.
"Whether it's a world-record transfer like Paul Pogba or a superstar like Zlatan Ibrahimovic brought in, there is always room for young players at this club if you're good enough."