The young centre-half is rated highly inside English football and quit Liverpool for United after falling out with coaching staff.
He told manutd.com: "I was an Under-16 at Liverpool and I felt the path through to the first team or even to the Reserves was blocked by the number of players that were being brought in from abroad, who weren't necessarily better than the English players already there.
"Those players were being brought in by Rafa Benitez and they were being played ahead of the English players coming through. They offered me a scholarship but I turned it down. Luckily for me, United were interested. They took me on a week's trial and once I knew they were interested I didn't want to look anywhere else. I've never looked back since."
Liverpool actually Wootton you as a 14-year-old in an under-18s tournament.
He continued: "Yeah. When I was playing for the Under-15s, I went to a tournament in America with the under-18s who had won the FA Youth Cup twice in a row. Steve Heighway took me along. I was only 14 and he told me that the club had only done that with two players before, Michael Owen and Steven Gerrard, so I felt very privileged."