The summer recruit from Crewe will be training with the first-team squad and bidding to earn a place in Sir Alex's central midfield.
Although facing the media glare with United is something that is new to the teenager, he took his first press conference as a Red in his stride.
"At Crewe, it was one camera and one person," he stated. "At United, it's the whole world.
"At Carrington, even with the building work around it, it is a complete change from Crewe. I thought Crewe's facilities were respectable but, to see this, it's a completely different world for me."
Sir Alex feels the player, at 18, still has some physical development to undertake but pledged that the youngster will train with the first-team squad every day.
"I've still got a lot to develop," added Powell. "I'm not near my best yet.
"I'm hoping to achieve what people expect me to achieve. I want to show I am a Manchester United player and show what I can do."