Coach Vicente del Bosque is due on Friday to announce his squad for Wednesday's friendly against Italy in Madrid, providing an indication of who is likely to be in his 23-man party for the finals in Brazil.
The 32 World Cup teams are obliged to send their squad lists to soccer's ruling body FIFA by June 2. The opening game is between the hosts and Croatia 10 days later.
Spain are in Group B with Netherlands, the side they beat in the 2010 final, Chile and Australia.
Bolivia failed to qualify for the World Cup.
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