England could be handed a fine by UEFA after plastic cups were thrown from the crowd in the direction of Gareth Southgate following their 0-0 draw with Slovenia.
The Three Lions had already secured progression to the knockout stage without kicking a ball after Albania failed to beat Spain the day before.
But there was still plenty to play for on Tuesday evening in Group C with England at risk of dropping down to third.
England had been far from convincing in their opening two group games and it was a similar story against Slovenia as they generated just 3.4 expected goals in the entire group stage - the lowest of any team at the tournament.
Plastic cups were thrown in the direction of Gareth Southgate after the draw on Tuesday
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The result didn't matter in the end as England still finished top with Denmark and Serbia also drawing.
However, England fans made their anger known at full time as loud boos could be heard ringing around the stadium in Cologne.
Southgate was seen walking around the ground applauding the England supporters, but the gesture wasn't reciprocated as some angry fans hurled plastic cups in the direction of the manager.
That could result in a fine for the England FA with UEFA coming down hard on unruly fan behaviour.
Albania, Croatia and Serbia have already been handed fines by UEFA for incidents involving fans.
Albania were ordered to pay up €12,375 after being found guilty of breaching Article 16(2)(b) DR 'throwing of objects' during their opening group match against Italy, along with other sanctions.
Croatia were fined €10,500 for fan trouble against Albania while Serbia were given a €4,500 fine for similar offences against England.
Luka Modric's country could face further punishment for the actions of their fans during their final group game against Italy.
Plastic cups were seen being thrown in the direction of Italy players throughout the match with suggestions that UEFA could look to ban alcohol in stadiums.
Croatia have already been punished and could be punished again
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Southgate was asked about the reaction he got from England fans after their match on Tuesday.
"I get it that they are not happy with me, that is the reality," Southgate admitted.
"I am not going to back away from that. I need them behind the team.
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Albania were given the biggest fine of the tournament
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"I have to deal with what I am dealing with. I was not going to back away from going over to thank people for coming and giving the support that they did, but I know that this is causing an issue for the group.
"I can deal with that but I need them to support the players.
"The more the fans are like they were in the second half, behind the team it is a massive lift for them, because we are operating in a very, very unusual environment."
