Vicente del Bosque says Munir El Haddadi was called up to the Spain squad as he was the logical choice, not because the Royal Spanish Football Federation (RFEF) want to secure the player's international future ahead of Morocco.
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Munir, 19, was added on Saturday to Del Bosque's squad to face Macedonia following the withdrawal of Diego Costa to injury.
The forward, who has impressed for Barcelona so far this season, was born in Spain to Moroccan parents.
Yet Del Bosque says Munir was simply called up due to already being based in the RFEF's training base, rather than to steal a march ahead of Morocco and award him a first competitive international cap.
"We've opted for a home-grown option with Munir," he is quoted as saying by AS. "We haven't made the decision so the player can't play for Morocco.
"There were reasons as to why Albert Celades initially called him up to the under-21 squad; he's developing really well and we expect good things from him. We called him up as he was also currently based in the federation's complex."
Spain begin their Euro 2016 qualifying campaign at home to Macedonia on Monday, but will be without Gerard Pique who asked to be left out of the squad due to his ongoing fitness issues.
Despite his request, the Barcelona player went on to play a full 90 minutes for Barcelona against Villarreal last Sunday. Del Bosque, however, says he had no problem with this and trusts in the defender's own assessment of his fitness.
"There is no contradiction, I mentioned that he called me to advise that he was slightly injured but wanted to join the squad," he said. "He's a committed guy. The only person to know how Pique is feeling is the player himself.
"I wasn't surprised that he played 90 minutes against Villarreal. He tells me that he has a slight knock but can still manage to play for his club. There's no need into look into the subject any further."