Former Rangers boss Gio van Bronckhorst was criticised by Dutch football fans for interrupting the rendition of 'You'll Never Walk Alone' by Celtic fans during the clash with Feyenoord.
The De Kuip faithful were left disappointed following the full-time whistle when Gustaf Lagerbielke scored a late winner for the Scottish Premiership champions - shortly after Yankuba Minteh had cancelled out Luis Palma's strike from the penalty spot in the final Group E clash.
But Feyenoord fans were already irked before a ball was even kicked after a surprise interruption from Van Bronckhorst and the RTL 7 punditry team.
Humberto Tan, Theo Janssen and former Feyenoord boss Van Bronckhorst were previewing the game as Arne Slot's side looked to prepare for their Europa League campaign with a positive result - as the Hoops' support broke out in their iconic pre-match sing-song.