Libya-born defender Sadiq El Fitouri has joined Manchester United from Evo-Stik First Division side Salford City on an 18-month deal.
Sadiq, 20, joined Salford City as a trialist in December after being released by Manchester City.
He said: "This is honestly a dream come true for me."
Salford part-owner and former United defender Phil Neville said the club was "immensely proud" to have given him an opportunity to play.
Neville added: "He had the determination and passion to play without necessarily having the chances."
Another co-owner Gary Neville tweeted: "Incredible story on Sadiq El Fitouri. Well done to Phil and Scholesy for showing belief in a lad who was out of the game!
"Phil and Scholesy gave him his Salford City debut just three weeks ago and the boy has signed for United. #dreamscometrue"