Not all of them will end up on the 23-deep Copa roster, which must be submitted by Friday (and unveiled perhaps Saturday). Seven, in fact, weren’t even on the prelim list and are not eligible for Copa selection: Julian Green, Emerson Hyndman, Fabrice Picault, Paul Arriola, Caleb Stanko, Zach Steffen and Amando Moreno.

The Puerto Rico match was a late addition to the pre-Copa calendar.

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“It’s really important in terms of transitioning our players coming in from Europe and some who are already done in Mexico to keep them in a flow, to keep them in a rhythm,” Klinsmann said. “We added some players coming from the younger side to look at them and to get a roster together, but the main purpose of this camp is to keep the rhythm, keep going and to transition perfectly into the preparation for the Copa America Centenario.”

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Aside from 19 MLS players who aren’t available until next week, Pachuca defender Omar Gonzalez, Monterrey defender Edgar Castillo and Club America defender Ventura Alvarado remain active in the Liga MX playoffs; Eintracht Frankfurt defender Timmy Chandler is involved in a Bundesliga relegation-promotion playoff against Nurnberg on Thursday and Monday; attacker Christian Pulisic is with Borussia Dortmund for the German Cup on Saturday against Bayern Munich; and goalkeeper Ethan Horvath is in-season in Norway.

MLS players selected to the final Copa squad will report to U.S. camp in the Dallas area following league matches this weekend. Others will also join the delegation when available. With the full team in place, the Americans will play friendlies May 25 against Ecuador in Frisco, Tex., and May 28 against Bolivia in Kansas City, Kan.

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The Copa opener is June 3 against Colombia at Levi’s Stadium in Santa Clara, Calif.

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The Puerto Rico friendly will kick off at noon ET on FS1, UniMas, Univision Deportes, Fox Sports Go, foxsoccer2go.com and univisiondeportes.com.

Reminder: This is the roster for the Puerto Rico friendly only; it’s not the Copa America roster.

Goalkeepers: Brad Guzan (Aston Villa), Tim Howard (Everton/Colorado Rapids), Zach Steffen (Freiburg).

Defenders: John Brooks (Hertha Berlin), Geoff Cameron (Stoke City), Eric Lichaj (Nottingham Forest), Matt Miazga (Chelsea), Michael Orozco (Tijuana), Tim Ream (Fulham), DeAndre Yedlin (Sunderland).

Midfielders: Alejandro Bedoya (Nantes), Emerson Hyndman (Fulham), Fabian Johnson (Moenchengladbach), Perry Kitchen (Hearts), Alfredo Morales (Ingolstadt), Caleb Stanko (Freiburg), Danny Williams (Reading).