[3] Isidro was the starting goalkeeper at Celta's first official game on 23 September 1923 against Boavista F.C., in which he was part of an 8-2 victory.

[4] In Celta's first year, the team became the Galician champion after winning the 1923-24 championship with Isidro and Lilo as goalkeepers.

On 24 March 1924, Isidro was Celta's goalkeeper in the team's debut at the Copa del Rey against Athletic Bilbao.

[5][6] However, Royal Spanish Football Federation agreed in December 1925 that Isidro's record was transferred to Deportivo.

[7] Being a player of Real Vigo Sporting, he was summoned to play for the Galicia national team, and he was one of the eleven footballers that played in the team's first-ever game on 19 November 1922, a 4-1 win over a Castile/Madrid XI in the quarter-finals of the 1922-23 Prince of Asturias Cup, an inter-regional competition organized by the RFEF.