In 1975, he signed a two-year contract with Schalke 04 of the German Bundesliga for what was a world record fee for that season.

In the 1976–77 season, Oblak's second year at the club, Schalke 04 finished the league in second place, behind Borussia Mönchengladbach.

During the 1945–1990 period, Oblak was among only a handful of Slovenian players, along with Srečko Katanec and Danilo Popivoda, who managed to get into the Yugoslavia national team.

[1] After retirement as a football player, Oblak started coaching at various Slovenian clubs, including three times at Olimpija Ljubljana,[2] NK Naklo[3] and FC Koper.

However, the team soon ran into a series of bad results, and the pressure mounted on Oblak, until finally in late 2006, he was fired from the job.

In Slovenia Branko Oblak was awarded this title, "beating" rivals such as Srečko Katanec and Zlatko Zahovič.