Eric Dier's confrontation with a supporter following Tottenham's FA Cup defeat to Norwich is being investigated by the Football Association.
It's understood the England midfielder's confrontation with someone in the West Stand at the Tottenham Hotspur Stadium is being looked at.
The 26-year-old is likely to face disciplinary action from the FA over the incident.
Dier went into the crowd to confront a supporter who was arguing with the player's brother.
Tottenham manager Jose Mourinho said he understood why he did it, and hoped the club would not take disciplinary action against Dier. It is understood Spurs will conduct a thorough review of the incident.
I think Eric Dier did something that we professionals cannot do but in these circumstances every one of us would do.
The incident happened in the area behind the dugouts, which is a corporate section, and Mourinho has criticised it for not housing "real Tottenham fans".
Of course some are Tottenham fans but I think a lot of corporate. A lot (are there by) invitation, a lot of people with special status and probably it's the place of the stadium where I sometimes have doubts over if they are the real Tottenham fans because these (real fans) are the ones who support the boys until the last.