Born in
Hondarribia,
Gipuzkoa,
Basque Country, Alkain joined
Real Sociedad in 2016 from
Antiguoko, and was initially assigned to
the C-team. On 10 January 2019, after establishing himself as a starter for the C's, he was loaned to
Segunda División B side
Arenas Club de Getxo for the remainder of
the season. Upon returning, Alkain was assigned to
the reserves also in the third division, and renewed his contract until 2021 on 1 July 2020. He was a regular starter during the
2020–21 campaign, scoring five goals as his side returned to
Segunda División after 59 years; on 5 July 2021, he extended his link for a further year. Alkain made his professional debut on 14 August 2021, coming on as a late
substitute for
Álex Sola in a 1–0 home win over
CD Leganés. He scored his first professional goal on 11 September, netting his side's second in a 3–2 home loss against
SD Eibar. Alkain and his teammate
Jérémy Blasco left
Sanse on 30 May 2022, with their contract expiring in the following month. On 7 June, he signed a three-year deal with
Deportivo Alavés,
freshly relegated to the second level. Alkain scored four goals in 36 appearances overall during the
2022–23 season, as the
Babazorros achieved promotion to
La Liga. He made his debut in the category on 21 August 2023, starting in a 4–3 home win over
Sevilla FC. On 30 July 2024, Alkain agreed to a two-year contract with Eibar in the second division. ==References==