A Sporting de Gijón youth graduate, he made his senior debut with the reserves on 3 February 2013, coming on as a first-half substitute in a 0–4 Segunda División B away loss against UD Salamanca.
[1] On 14 August 2013, Donoso signed a professional three-year deal with the Rojiblancos,[2] and scored his first senior goal on 1 September, netting the first in a 4–1 home routing of CD Tropezón.
[3] On 10 September he was called up to the main squad for a Copa del Rey match against Recreativo de Huelva,[4] but remained unused in the 2–3 loss in the extra-time.
On 1 July 2016, after spending the rest of his spell exclusively with the B-team, Donoso signed a three-year contract with Segunda División side Córdoba CF.
[11] On 2 July 2019, despite suffering a knee injury which shortened his contribution to the side's promotion to the second division, Donoso signed a permanent contract with the Castilian-Leonese club.