Tottenham goalkeeper Guglielmo Vicario clashed with supporters after the club slipped to a lacklustre 1-0 defeat to AZ Alkmaar in their Europa League last-16 tie.
A freak Lucas Bergvall own goal proved the difference between the sides in The Netherlands.
Vicario prevented Tottenham from facing a larger deficit ahead of the second leg, with the Italian making fine stops from Troy Parrott and Ernest Poku.
The 28-year-old attempted to rally Spurs supporters after the final whistle.
Vicario was seen demonstratively raising his arms towards the away fans, appearing to be calling for more support.