In summer 2015, Valerón renewed his contract with the "Amarillos" for a further year. On 26 September, he first appeared with the club in the top flight, featuring 22 minutes in a 1–2 away loss to Barcelona in what was his first game in the competition in 847 days, and becoming the fifth oldest player to play there at the age of 40 years and 101 days; he climbed one position on 12 December after coming on as substitute against Real Betis, surpassing former Deportivo teammate Donato.