The Seattle Sounders are set to sign 15-year-old midfielder Danny Leyva to a first-team contract, two sources told The Athletic, a move that would make him the youngest signing in the team’s history.



Leyva, who signed with the Sounders USL team Tacoma Defiance last fall, was the second-youngest player ever to start a USL match when he made his pro debut last season. The Las Vegas native will turn 16 next month.



“We’ve been really pleased with Danny’s development,” Sounders FC director of player development Marc Nicholls said last year, when the club announced the signing. “He’s a rangy midfielder who has an eye for goal and is very capable as a defensive player and ball-winner. He’s a highly intelligent player and has a maturity beyond his years in terms of his decision-making.”



Leyva has trained with the Sounders first team throughout 2019 and made his debut for the MLS side this preseason when he entered...