Gio van Bronckhorst has demanded social media companies get tough on racism after Rangers defender Connor Goldson was targeted online.
The 29-year-old was involved in a post-match row with the Red Star players as the home side reacted angrily to the celebrations after the Ibrox side reached the last eight.
At the start of the season the defender posted a pic from the Marakana stadium with the caption: "New season, new goals! Its work time!"