"Carlos has a contract with Red Bull, who brought him into F1 and he's there for the investment they made.
"So at the moment we do not intend to release any of our drivers," Horner, the Red Bull team boss, told the Spanish broadcaster Movistar.
"Carlos is developing and the Toro Rosso is a good car that should give him good opportunities. He's still very young but we value him a lot and that's why we don't want to get rid of him," he added.
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