"I had different expectations when I first came here," Pedro was quoted as saying in Spanish media.
"It is difficult for me to play this role (as a substitute) and if there is no continuity it is not worth me turning up just to be part of the group," he added.
"I always want to be involved on the pitch, so I am going to keep working hard to try to play and be in the best possible shape to help the team."
Spain, who are certain of advancing to the knockout rounds, still need one point to secure top spot in their pool when they conclude their group stage campaign against Croatia in Bordeaux on Tuesday.
(Reporting by Ian Rodricks in Bengaluru; Editing by John O'Brien)
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