Pereira has just moved to Hearts on a season-long loan.
“Sir Alex was the manager when I first arrived and then I've had them all," Pereira told the Daily Record. “I came as a 15-year-old for the first time and I remember seeing him for the first time in the canteen.
“Face to face he talked to me and that's when I knew I wanted to come to Manchester United because at the time I had different options.
“The way he spoke, at that second I made my mind up to go to the club. I couldn't speak a word of English so it wasn't very easy to understand.
“I had someone translate but he said I was at the best club in the world and he told me to do great things. When these words come from a legend you listen. I more than ever believed that I was at the best club in the world."