 After impressing in the 2017–18 pre-season, Agirretxe made a return to competitive action on 19 August 2017 following a 20-month hiatus, replacing captain Xabi Prieto as their team came from behind to defeat hosts RC Celta de Vigo 3–2 in the opening round of league fixtures.He made 13 appearances across all competitions, but only played more than 45 minutes in two of them.On 29 August 2018, Agirretxe announced his retirement from playing professionally at the age of 31, having never fully recovered from his 2015 injury.