The 21-year-old made his professional debut in February 2018 for his previous club and his senior Wales debut in November of the same year.
James is exhilarated over his new signing and called it one of the best days of his life.
"This is one of the best days of my life and a challenge I am really looking forward to. The Premier League is the best league in the world and Manchester United is the perfect place for me to continue to develop as a player," club's official website quoted James, as saying
"Daniel is an exciting young winger with lots of skills, vision, exceptional pace and a good work ethic. He had a great season with Swansea City and has all the attributes needed to become a Manchester United player. We are delighted he has signed with our club and we are all looking forward to working with him. This is the perfect environment for Daniel to continue his development," Solskjaer said.
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