https://en.wikipedia.org/wiki/2018_FIFA_World_Cup_squads#Costa_Rica
http://yashinquesada.com/selecciones-nacionales-app/27792
Costa Rica
Goalkeepers:
1 Keylor Navas (aged 31) (Real Madrid)
18 Patrick Pemberton (aged 36) (Alajuelense)
23 Leonel Moreira (aged 28) (Herediano)
Defenders:
3 Giancarlo González (aged 30) (Bologna)
2 Johnny Acosta (aged 34) (Águilas Doradas)
16 Cristian Gamboa (aged 28) (Celtic)
8 Bryan Oviedo (aged 28) (Sunderland)
6 Óscar Duarte (aged 29) (Espanyol)
15 Francisco Calvo (aged 25) (Minnesota United)
19 Kendall Watson (aged 30) (Vancouver Whitecaps FC)
22 Rónald Matarrita (aged 23) (New York City FC)
4 Ian Smith (aged 20) (Norrköping)
Midfielders:
10 Bryan Ruiz (captain) (aged 32) (Sporting CP)
5 Celso Borges (aged 30) (Deportivo La Coruña)
7 Chrsitian Bolaños (aged 34) (Saprissa)
14 Randall Azofeifa (aged 33) (Herediano)
17 Yeltsin Tejeda (aged 26) (Lausanne)
20 David Guzmán (aged 28) (Portland Timbers)
13 Rodney Wallace (aged 29) (New York City FC)
9 Daniel Colindres (aged 33) (Saprissa)
Forwards:
12 Joel Campbell (aged 25) (Real Betis)
21 Marco Ureña (aged 28) (Los Angeles FC)
11 Johan Venegas (aged 29) (Saprissa)