Tim Weah made the United States roster for this month's FIFA Under-20 World Cup in Poland, while Joshua Sargent and Tyler Adams were left off Friday, making it likely they will be with the senior national team at the CONCACAF Gold Cup.

Alex Mendez heads the 21-man roster after scoring eight goals with six assists at last year's CONCACAF Under-20 Championship. Mendez left the LA Galaxy youth system last fall to sign with Germany's Freiburg.

Weah, a son of Liberia President and 1995 FIFA Player of the Year George Weah, scored three goals against Paraguay in the round of 16 at the 2017 Under-17 World Cup. He has one goal in eight appearances with the senior national team. Weah has spent this season on loan from Paris Saint-Germain to Scottish giants Celtic and has four goals in 17 matches.

In an Instagram post, Weah said Celtic manager Neil Lennon told him "that it is in the best interest of the team that I collect my things and go home rather than be apart of the game on Sunday," referencing Celtic's Old Firm derby against rivals Rangers.

Weath thanked the Celtics fans for their support, adding: "It was a true honor playing for this club and also having the opportunity to interact with legends who paved the way for us."

Sargent scored five goals at the 2017 Under-17 World Cup and twice at the 2017 Under-20 World Cup. He made his debut for Werder Bremen this season and has two goals in 10 games.

Mendez is among 14 players on coach Tab Ramos' roster who played at the CONCACAF tournament.

Goalkeeper Brady Scott is the loan holdover from the 2017 Under-20 World Cup roster.

- Davis: Lletget is the most interesting man in U.S. Soccer

The U.S. opens against Ukraine on May 24, plays Nigeria three days later and closes the group stage against Qatar on May 30. The Americans were eliminated in the quarterfinals in 2015 and 2017. Weah may miss the opening match to remain with Celtic, which plays in the Scottish Cup final May 25.

Ramos, who played for the U.S. at three World Cups, will be coaching the Americans at the Under-20 World Cup for the fourth straight tournament.

Full U.S. roster:

Goalkeepers: C.J. Dos Santos (Benfica, Portugal), David Ochoa (Salt Lake), Brady Scott (Cologne, Germany)

Defenders: Sergino Dest (Ajax, Netherlands), Chris Gloster (Hannover, Germany), Aboubacar Keita (Richmond), Mark McKenzie (Philadelphia), Matthew Real (Philadelphia), Chris Richards (Bayern Munich, Germany)

Midfielders: Edwin Cerrillo (Dallas), Chris Durkin (D.C,), Richard Ledezma (PSV Eindhoven, Netherlands), Alex Mendez (Freiburg, Germany), Paxton Pomykal (Dallas), Brandon Servania (Dallas)

Forwards: Ayo Akinola (Toronto). Konrad De La Fuente (Barcelona, Spain), Ulysses Llanez (Wolfsburg, Germany), Justin Rennicks (New England), Sebastian Soto (Hannover, Germany), Tim Weah (Celtic, Scotland)