Gil made his professional debut on 24 August 2015, starting in a 0–1 home loss against Girona FC.[4] He scored his first professional goal on 4 April of the following year, netting his team's first in a 2–1 home win against Real Oviedo.
On 16 August 2016, Gil was loaned to Oviedo in a season-long deal.[5] After appearing sparingly, he returned to Athletic and their B-side, now in the third division.
Gil made his first team debut on 25 October 2017, playing the full 90 minutes in a 1–1 Copa del Rey away draw against SD Formentera.[6] The following 29 May, he was released as his contract expired.[7]