Andres Iniesta, Gerard Pique and Sergio Ramos are among the players who could feature at the Olympic Games for Spain this summer.
Spain U21 coach Luis De la Fuente has sent off his pre-list of players that could represent La Roja in Tokyo, Japan, with Manchester City's David Silva also included.
De la Fuente is allowed to call up three players over 23 for the competition, with Pique and Ramos both expressing interest in competing in the past.
Iniesta is already in Japan, where he has been playing for Vissel Kobe since leaving Barcelona.
The pre-list has not been made public but SPORT have had access to it to confirm that Iniesta, Pique, Ramos and Silva are on the list.