 On 1 September 2010, Olympiacos parted ways with Óscar, who signed a one-year contract with his first professional club Valladolid, now playing in the Segunda División.On 20 July 2011, he signed a two-year extension with the option of making his link a permanent one.Óscar netted 14 goals in the 2011–12 season, as the "Pucelanos" returned to the top flight after two years.