The Serbian Football Association (FSS) has opened an investigation following reports that a first division match between Red Star Belgrade and city rivals OFK was rigged.

Visiting Red Star, the 1991 European Cup winners, won the game 6-2 after trailing 2-0 at half-time on the opening day of the 16-team championship.

Belgrade media was awash with reports after the game that unidentified individuals stor-med into the OFK dressing room at half-time and asked them to “take their foot off the gas pedal”.

Some former and current Serbian coaches also expressed concern that Red Star’s comeback was too good to be true given the comical nature of the goals that OFK conceded.