Here's the list of the 50 finalists, with the NYCFC players highlighted. Without having tried to actually pick my 24, I would expect Harrision is a lock, Mata should make it and Bravo and Lopez won't.
Anatole Abang (New York Red Bulls, on loan at Hobro IK, Denmark)
Kellyn Acosta (FC Dallas)
Luciano Acosta (D.C. United, on loan from Boca Juniors, Argentina)
Juan Agudelo (New England Revolution)
Fatai Alashe (San Jose Earthquakes)
Jordan Allen (Real Salt Lake)
Federico Bravo (New York City FC, on loan from Boca Juniors, Argentina)
Victor Cabrera (Montreal Impact)
Jonathan Campbell (Chicago Fire)
Jay Chapman (Toronto FC)
Sean Davis (New York Red Bulls)
Marky Delgado (Toronto FC)
Tsubasa Endoh (Toronto FC)
Diego Fagundez (New England Revolution)
Kianz Froese (Vancouver Whitecaps FC)
Justen Glad (Real Salt Lake)
Jesse Gonzalez (FC Dallas)
Carlos Gruezo (FC Dallas)
Marlon Hairston (Colorado Rapids)
Jordan Hamilton (Toronto FC)
Jack Harrison (New York City FC)
Cristian Higuita (Orlando City SC)
Femi Hollinger-Janzen (New England Revolution)
Cyle Larin (Orlando City SC)
Mikey Lopez (New York City FC)
Kekuta Manneh (Vancouver Whitecaps FC)
Ronald Matarrita (New York City FC)
Jimmy Medranda (Sporting Kansas City)
Lucas Melano (Portland Timbers)
Eric Miller (Colorado Rapids)
Jordan Morris (Seattle Sounders FC)
Alex Muyl (New York Red Bulls)
Lucas Ontivero (Montreal Impact, on loan from Galatasaray, Turkey)
Tim Parker (Vancouver Whitecaps FC)
Matt Polster (Chicago Fire)
Alvas Powell (Portland Timbers)
Rafael Ramos (Orlando City SC)
Rodrigo Ramos (Chicago Fire)
Tommy Redding (Orlando City SC)
Carlos Rivas (Orlando City SC)
Cristian Roldan (Seattle Sounders FC)
Keegan Rosenberry (Philadelphia Union)
Dillon Serna (Colorado Rapids)
Tommy Thompson (San Jose Earthquakes)
Erick ‘Cubo’ Torres (Houston Dynamo, on loan at Cruz Azul, Mexico)
Wil Trapp (Columbus Crew SC)
Jose Villarreal (LA Galaxy)
Brandon Vincent (Chicago Fire)
Joshua Yaro (Philadelphia Union)
Walker Zimmerman (FC Dallas)
Anatole Abang (New York Red Bulls, on loan at Hobro IK, Denmark)
Kellyn Acosta (FC Dallas)
Luciano Acosta (D.C. United, on loan from Boca Juniors, Argentina)
Juan Agudelo (New England Revolution)
Fatai Alashe (San Jose Earthquakes)
Jordan Allen (Real Salt Lake)
Federico Bravo (New York City FC, on loan from Boca Juniors, Argentina)
Victor Cabrera (Montreal Impact)
Jonathan Campbell (Chicago Fire)
Jay Chapman (Toronto FC)
Sean Davis (New York Red Bulls)
Marky Delgado (Toronto FC)
Tsubasa Endoh (Toronto FC)
Diego Fagundez (New England Revolution)
Kianz Froese (Vancouver Whitecaps FC)
Justen Glad (Real Salt Lake)
Jesse Gonzalez (FC Dallas)
Carlos Gruezo (FC Dallas)
Marlon Hairston (Colorado Rapids)
Jordan Hamilton (Toronto FC)
Jack Harrison (New York City FC)
Cristian Higuita (Orlando City SC)
Femi Hollinger-Janzen (New England Revolution)
Cyle Larin (Orlando City SC)
Mikey Lopez (New York City FC)
Kekuta Manneh (Vancouver Whitecaps FC)
Ronald Matarrita (New York City FC)
Jimmy Medranda (Sporting Kansas City)
Lucas Melano (Portland Timbers)
Eric Miller (Colorado Rapids)
Jordan Morris (Seattle Sounders FC)
Alex Muyl (New York Red Bulls)
Lucas Ontivero (Montreal Impact, on loan from Galatasaray, Turkey)
Tim Parker (Vancouver Whitecaps FC)
Matt Polster (Chicago Fire)
Alvas Powell (Portland Timbers)
Rafael Ramos (Orlando City SC)
Rodrigo Ramos (Chicago Fire)
Tommy Redding (Orlando City SC)
Carlos Rivas (Orlando City SC)
Cristian Roldan (Seattle Sounders FC)
Keegan Rosenberry (Philadelphia Union)
Dillon Serna (Colorado Rapids)
Tommy Thompson (San Jose Earthquakes)
Erick ‘Cubo’ Torres (Houston Dynamo, on loan at Cruz Azul, Mexico)
Wil Trapp (Columbus Crew SC)
Jose Villarreal (LA Galaxy)
Brandon Vincent (Chicago Fire)
Joshua Yaro (Philadelphia Union)
Walker Zimmerman (FC Dallas)