Tiberio Guarente has signed a five-year deal at Sevilla.
Guarente has spent the past three seasons at Atalanta, where he has made 92 appearances in Serie A, but could not help them avoid being relegated last season.
The Italian midfielder started with the Atalanta youth team but began his professional career at Verona before returning to Bergamo in 2007.
He signed a new five-year deal just last summer but relegation has seen him leave the Stadio Atleti Azzurri d'Italia.
The 24-year-old becomes Sevilla's second summer signing following the arrival of defender Mouhamadou Dabo and his release clause has been set at €30 million.