 He started his 19-year senior career with Real Oviedo.Sietes, who was born in Sietes, Asturias, receiving his nickname from his birthplace, started playing for local giants Real Oviedo, first appearing with the first team on 27 March 1994 in a 0–0 away draw against Real Valladolid.With just nine La Liga matches throughout the entire season, he did score two goals in back-to-back 3–0 wins, over Athletic Bilbao and Atlético Madrid.