Midfielder Ryan Blair has joined Swansea on a three-and-a-half year deal from Falkirk for an undisclosed fee.
The 19-year-old has made 10 appearances for Falkirk's first team, including seven league games, since making his debut during the 2014-15 season.
Glasgow-born Blair will link up with City's under-21 squad.
"For me this is a once-in-a-lifetime opportunity and I just can't wait to get started," Blair told Swansea City's official website.
"It feels great. I never thought I would get the opportunity to join a Premier League club.
"I want to kick on now and get myself some game-time between now and the end of the season."
Blair is the fourth former Falkirk player to join Swansea's development squad in the last two years following the arrival of Botti Biabi, Stephen Kingsley and Jay Fulton.
"The three of them being here will help me settle quicker. They are all good players and I am looking forward to getting out on the pitch with them," Blair added.