Born in A Coruña, Galicia, Mosquera joined Deportivo de La Coruña's youth setup in 2009, aged ten. In 2018, after finishing his formation, he was assigned to farm team Laracha CF of the Tercera División, and made his senior debut on 30 September of that year by coming on as a late substitute in a 1–0 home win over RC Villalbés.
