Eric Dier was involved in an extraordinary confrontation with a supporter in the middle of a stand just moments after Tottenham's penalty shootout defeat by Norwich.
Dier is seen on mobile phone footage climbing more than 10 rows into his home stadium to clash with the fan, shouting: "He's my brother, he's my brother."
It is likely the England international will face questions from the Football Association, but manager, Jose Mourinho, says he hopes the club takes no action against him.
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Mourinho explained that Dier's actions were sparked after his younger brother, who was watching from the stand, took issue with another supporter. A source said later that Dier was looking for his family in the crowd and responded after one fan who had been having a go at him during the match apparently made a gesture, presumed to be offensive, towards him.