Platko began his career as a goalkeeper in his hometown of Budapest with local club Vasas SC in 1917. After a brief spell in Austria at Wiener AF in 1920, he returned to Vasas for another season. Between 1917 and 1923, Platko also played six games for Hungary. In the season 1921/22 he was the coach and goalkeeper[4] for KAFK Kula from Kula (Serbia) where he won the Subotica subassociation championship earning promotion to the Second League of the Kingdom of Serbs, Croats and Slovenes.[5] In 1922 MTK played two friendlies against FC Barcelona. Both games finished as 0–0 draws and FC Barcelona, impressed with Platko offered him a contract.
Platko replaced the legendary Ricardo Zamora, but soon established himself as a legend in his own right. He spent seven years at FC Barcelona between 1923 and 1930. During that time he won six Campionat de Catalunya titles, three Copa del Rey and the first ever La Liga title.[6] The poem Oda A Platko came about following the Copa del Rey final in 1928. FC Barcelona took three games to beat Real Sociedad and during the first encounter on 20 May, Rafael Alberti was so impressed with the bravery of Platko that he later wrote the poem in his honour. Platko finished his playing career at Recreativo de Huelva and retired as a player in 1931. He soon began his career as a coach, working in France with FC Mulhouse (1932–33) and Racing Club de Roubaix (1933–34), before returning to FC Barcelona as a coach for the 1934/35 season. Despite guiding the club to another Campionat de Catalunya, the following season he was replaced by Patrick O'Connell. After two decades away from the club Platko was reappointed coach of CF Barcelona for the 1955/56 season. During this season the club, inspired by Ladislao Kubala and Luis Suárez, won 10 consecutive La Liga games in a row. The record remained unbeaten until 2005. Despite this run CF Barcelona only managed to finish second in La Liga behind Atlético Bilbao and Platko was replaced the following season.
For the season 1955/56 he returned to FC Barcelona with which he became runner up in the league one point behind Athletic Bilbao. His balance of 22 wins three draws and five defeats had been the best for the club yet. The series of ten straight wins in the league was only outdone under Frank Rijkard in the 2005/06 season. His downfall was a 1–3 defeat on 20 May in the cup quarterfinals against local rivals Español. The club concluded, the relationship between the team and Plattkó was broken, and replaced him for the return match, which ended 4-4, with the club legend Josep Samitier.
The next years Plattkó spent in Brazil as talent scout and player observer. later he returned to Chile where in 1965 he took on a last coaching assignment when he took on lowly first division outfit CD San Luis de Quillota from the region of Valparaíso, with which he ended third from the bottom, which however was one up from the previous season.
Tamás Dénes, Mihály Sándor, Éva B. Bába: A magyar labdarúgás története I.: Amatorök és álamatorök (1897–1926), Campus Kiadó (Debreceni Campus Nonprofit Közhasznú Kft.), Debrecen (HU), 2014. ISBN978-963-9822-11-5
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