The 18-year-old successfully completed his medical at Old Trafford on Tuesday.
United could decide to loan the striker to an English club or send him back to his present team Universidad in Chile.
“I am super happy to get to Manchester United. I’m fulfilling a dream,” he said.
“I am going where I wanted. You look on television and see the outstanding players, scoring spectacular goals. I cannot waste this opportunity. It is not clear what will happen with my future.
“I want to play in the first team of Manchester United. That’s my first thought.
“If they decide to send me on loan, I would prefer to continue at Universidad, although I will do whatever United deem appropriate.”
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Being an amiable guy is good for you and Jurgen Klopp is living proof.
Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.