The 21 year-old winger has agreed a contract to 2029, reports Marca. A formal announcement is due in the coming days.
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Sierra moved to Sevilla in 2024 from Granada and broke into the first team this season.
Since his debut in the Seville derby in the first half of the season, he has played in four Liga matches (against Betis, Oviedo, Celta, and Elche) and one Copa del Rey match (against Alavés), accumulating a total of 71 minutes.
For Sevilla Atlético, he has played 17 matches, all as a starter, scoring one goal and providing two assists.