[1] After retiring, he had a short spell at Deportivo Balompié as manager.

[2] Born in Madrid, he began his career at his hometown club Racing de Madrid in 1914, with whom he won the 1914–15 Centro Championship together with Joaquín Pascual, Ezequiel Montero, Antonio De Miguel, and Ricardo Álvarez,[3] with the latter two also being his teammates at Madrid FC.

He stood out at Racing for his goalscoring ability, which eventually drew the attention of Madrid FC, who signed him in 1917, and despite helping the club win the Centro Championships in 1917–18, and reach the 1918 Copa del Rey Final, starting in a 0-2 loss to Real Unión,[4] Rey returned to Racing at the end of the 1917–18 season, where he finished his career.

[5] Rey was also a member of the Madrid team that won the 1918 Prince of Asturias Cup,[6] which consisted of a two-legged final against Cantabric, and he scored the winning goal of the first leg in a 3–2 win, thus contributing decisively in the capital side's triumph.

[7] After retiring he became a manager, taking the helm of Deportivo Balompié in 1929, but his coaching career was short-lived as he left this position at the end of the 1929–30 season, and never again managed other side.