The 1963–64 Yugoslav First League season was the 18th season of the First Federal League (), the top level football league of SFR Yugoslavia, since its establishment in 1946. Fourteen teams contested the competition, with Red Star winning their 7th title. Teams At the end of the previous season Sloboda and Budućnost were relegated. They were replaced by Vardar and Trešnjevka. League table Results Top scorers The Planinić Affair In August 1965, at the beginning of the 1965-66 season—fourteen months after the end of the 1963-64 season when the alleged transgressions had taken place—FK Željezničar goalkeeper Ranko Planinić came forward with information alleging match-fixing. He claimed that towards the end of the season his club threw its league matches against Hajduk Split and NK Trešnjevka in exchange for monetary payouts, which the two relegation-threatened teams decided to pay in order to help themselves avoid the drop to the Yugoslav Second League. Specifically, Planinić claimed that the match played on 31 May 1964 in Split—Hajduk's 4-0 win over Željezničar—was fixed, as well as the following week's match on 7 June 1964 in Sarajevo that saw Željezničar and visiting Trešnjevka play to a 3-3 draw. He was in Željezničar's goal in both matches. Planinić made the information public in August 1965, fourteen months after the fact, by approaching a Večernje novine journalist Alija Resulović who in turn took Planinić's testimony in form of an interview that was published by the paper with circulation of 100,000 copies at the time. In his 2006 book Ona vremena, Resulović claims to have contacted FK Željezničar's president Nusret Mahić right before submitting the piece for publishing, informing him of Planinić's allegations, seeking comment, and even offering to sit on the information if he (Mahić) thinks it necessary. Resulović further claims that Mahić's response was: "Publish it all! It's all a lie that Planinić concocted as revenge after being fined for a training session incident he had caused". The explosive testimony erupted in a nationwide scandal that would become known as the 'Planinić Affair'. In the years prior, on multiple occasions, Yugoslav First League had been plagued by rumours of widespread match-fixing, however, this was the first instance of a player coming forward as whistleblower and substantiating those claims on the record. Investigation Right after Planinić's allegations hit the press, the Yugoslav FA (FSJ) disciplinary body (disciplinski sud) began an investigation into the two matches Planinić claimed