CHICAGO — Schalke forward Matthew Hoppe and Bayern Munich youth team defender Justin Che were among 27 players selected Thursday for a training camp ahead of the United States' exhibition against Switzerland in St. Gallen on May 30.

Galatasaray defender DeAndre Yedlin, who has not played for the U.S. since November 2019, was picked along with Greuther Fürth midfielder Julian Green, who made his last international appearance in November 2018. Yedlin, who has regained playing time since his transfer from Newcastle in January, is the most experienced player, with 62 appearances.

A pair of goalkeepers with no appearances also were selected: Leicester's Chituru Odunze and Salt Lake's David Ochoa.

Hoppe, a 20-year-old from Yorba Linda, California, has six goals in 21 league games this season. On Jan. 9 against Hoffenheim, he became the first American to score a hat trick in the Bundesliga.

U.S. coach Gregg Berhalter will be evaluating players training at altitude in the Alps for the 23-man roster for the CONCACAF Nations League semifinal against 67th-ranked Honduras at Denver on June 3. Two of the players expected to be on that roster will miss the exhibition at 13th-ranked Switzerland: Chelsea forward Christian Pulisic and Manchester City goalkeeper Zack Steffen will be in Porto, Portugal, on May 29 when their clubs meet in the European Champions League final.

Four others on the roster are uncertain for the Switzerland game.

Leipzig midfielder Tyler Adams returned to the U.S. for treatment of a back injury and will miss his club's Bundesliga finale this weekend.

Barnsley forward Daryl Dike would miss the Swiss match if his club overcomes a 1-0 deficit from the first leg and beats Swansea to reach the English promotion playoff final in London on May 29.

Werder Bremen forward Josh Sargent and Green may find themselves in the Bundesliga promotion-relegation playoff over two legs on May 26 and 29.

American players start reporting Saturday for training, which begins Monday. The average age of the roster on Monday will be 23 years, 37 days.

Just four of the players are from Major League Soccer. Seven are based in Germany, four in England, three in Belgium and two each in Italy and Spain.

The 20th-ranked U.S. also plays No. 11 Mexico or No. 50 Costa Rica on June 6 in the CONCACAF Nations League final or third-place game at Denver, then faces Costa Rica in an exhibition on June 9 at Salt Lake City. The travel is designed to be similar to that during a segment of the compacted World Cup qualifying schedule that starts in September.

Switzerland is preparing for the European Championship, where it meets Italy, Turkey and Wales in Group A.

The roster:

Goalkeepers: Ethan Horvath (Club Brugge, Belgium), Chituru Odunze (Leicester, England), David Ochoa (Salt Lake)

Defenders: John Brooks (Wolfsburg, Germany), Reggie Cannon (Boavista, Portugal), Justin Che (Bayern Munich, Germany), Sergiño Dest (Barcelona, Spain), Mark McKenzie (Genk, Belgium), Matt Miazga (Anderlecht, Belgium), Tim Ream (Fulham, England), Bryan Reynolds (Roma, Italy), Antonee Robinson (Fulham, England), DeAndre Yedlin (Galatasaraym Turkey)

Midfielders: Kellyn Acosta (Colorado), Tyler Adams (Leipzig, Germany), Julian Green (Greuther Fürth, Germany), Sebastian Lletget (LA Galaxy), Weston McKennie (Juventus, Italy), Yunus Musah (Valencia, Spain), Jackson Yueill (San Jose)

Forwards: Brenden Aaronson (Red Bull Salzburg, Austria), Daryl Dike (Barnsley, England), Matthew Hoppe (Schalke, Germany), Gio Reyna (Borussia Dortmund, Germany), Josh Sargent (Werder Bremen, Germany), Jordan Siebatcheu (Young Boys, Switzerland), Tim Weah (Lille, France).