Ramon Maddoni, 60, has discovered some of Argentina's greats, including Juan Roman Riquelme, Pablo Aimar and Fernando Redondo and he told The Sun: "Carlos has worked hard to get where he is today and deserves to be at a great club. I'm sure Alex Ferguson will bring out the best in him.
"I have worked with many talented young players and one of Carlos' great virtues is his desire to be as good as he can be and never accept defeat. Carlitos has the ability to go as far as he wants.
"The heart and hunger he has for the game and desire he shows makes him stand apart. He has technique and is aggressive and has everything to be one of the greatest players.
"I remember when I first saw him. He was fearless in the way he played against older and bigger boys and wasn't bothered if they tried to kick him.
"I helped him develop but when a player has natural talent you only have to guide him for the talent to shine through. That's what will happen at Manchester United."
Tevez recalled: "I remember when Ramon Maddoni, who was like a father to me, discovered me. I was just a kid, eight.
"The game had finished and I was still kicking around and two men came up to me and said: 'We've been looking for you everywhere.' But I had no idea what they wanted.
"I joined a team called Club Parque but didn't like it because they made me dribble around cones, practising for hours.
"I went home saying I would not be back. But they came to collect me again and now I'm grateful."