He subsequently worked as a coach in Europe and South America, most notably with FC Barcelona, Colo-Colo, River Plate, Boca Juniors and Chile.

Plattkó was an early FC Barcelona great and was a team-mate of Paulino Alcántara, Josep Samitier and Sagibarba.

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 Plattkó that he later wrote the poem in his honour.

During this season the club, inspired by Ladislao Kubala and Luis Suárez, won 10 consecutive La Liga games in a row.

Despite this run Barcelona only managed to finish second in La Liga behind Athletic Bilbao and Plattkó was replaced the following season.

In 1940 he had a spell in charge of River Plate in Argentina before he returned to Chile and Colo-Colo in 1941, winning a second Chilean Primera División.

The club concluded, the relationship between the team and Plattkó was broken, and replaced him for the return match, which ended 4-4, with Josep Samitier.

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.