Former Tottenham boss Tim Sherwood could not believe his eyes when he saw Eric Dier running into the stands to confront supporters.

Dier was involved in an unsavory incident near the end of their FA Cup defeat against Norwich City.

Not only are Jose Mourinho's team out of the competition, but Dier could face disciplinary action for the incident.

"It surprised me because he's a mild-mannered guy, Eric," Sherwood told Sky Sports News.

"But something serious has gone on there. Something has triggered it - pushed the button. We've all got that button. Some are hotter than others.

"Unfortunately, if something is said out of turn, that you get upset with - and Jose said it himself; we need to be professional, bite our lip, not to go there - but sometimes it happens.

"I'm not going to sit here and criticise Eric Dier. Something serious has obviously gone on there for him to step into that crowd, walk up 10 chairs and confront the guy who he was very upset with.

"I bet the guy was sweating when he saw a 6ft 5in Eric Dier marching towards him. These boys are very strong and powerful. If it was on the street that guy wouldn't be criticising him would he?

"Just because he is on the football pitch, he's trying his best for the club, things aren't going well, frustrations boil over, you've just got to get on with it. Eric is upset as well at being knocked out of the FA Cup.

"The fans pay their money but it doesn't give them the right to say what they want and totally criticise the players. There is a limit. There is a line that needs to be drawn."