The young winger has penned a new contract to 2029.
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Sierra made his Sevilla debut this season and has made four LaLiga appearances so far.
El Desmarque says Sevilla are also in talks with Andres Castrin about a new deal.
Currently tied to Sevilla to 2027, management are offering centre-half Castrin a new three-year extension through to 2030.
Furthermore, the Galician defender would be officially registered with the first team. This is a well-deserved reward for a player who has featured in 15 matches this season across La Liga and the Copa del Rey, starting nine of them.