In 1930, Mateos married María Purificación de Lacunza y Goiri, but they had no children. On 10 April 1937, the news was made public that Mateos had been shot in Bilbao, but this news would not be true and months later, on 21 September, he was appointed sole Manager of the Biscayan Federation. On 14 September 1939, the Executive Commission of the National Sports Council met to appoint the Board of Directors of the RFEF, and
Julián Troncoso, as the new president of the RFEF, appointed the territorial presidents as members, including Mateos. In March 1946, Mateos was awarded the prize from the National Sports Delegation, for his work in favor of sports and particularly for his work as a sports critic; the prize was given to him by
General Moscardo. In 1950, Mateos published his most important work,
Nueve años de seleccionador ("Nine Years as a Coach") (1950), where he recounted his experiences as the coach of the Spanish national team. He donated the benefits of this book in favor of the Biscayan footballers. In 1952, the "José María Mateos" trophy was created, and on 28 June, he himself presented the cup to the captain of
SD Indautxu, Pachi Urquiola, winner of the final against
Barakaldo CF with a result of 1–0. In December 1958, in the
Basilica of Begoña, the Charity Cross was imposed on him as a tribute to his good work for the benefit of others. He also received a belated tribute from the press and sports, shortly before he died at his home, when, almost blind, it was already impossible for him to write. Mateos reduced his journalistic activity due to a surgical intervention, in which a leg had to be amputated, and as a result of his illness he became blind, but even so, he continued to send articles to
La Gaceta; he spoke and his wife wrote. ==Death==