Phil Foden and Mason Greenwood have been sent home from England duty after breaching the team's coronavirus guidelines.
Manager Gareth Southgate said today that the Manchester City midfielder and the Manchester United forward would not be travelling from Iceland, where they made their senior England debuts on Saturday, to Denmark for Tuesday's Nations League match.
"Unfortunately this morning it was brought to my attention that the two boys have broken the Covid guidelines in terms of our secure bubble - we had to decide they couldn't have interaction with the rest of the team," Southgate said.
Allegations emerged in the Icelandic media outlet DV on Monday that the pair were visited by two local girls during the trip.
"Given the procedures we have to follow they will have to travel home separately," added Southgate.
"Nothing has happened in the areas we occupy in the hotel. We are still getting to the depths of all the information because this was only brought to my attention a couple of hours before training, so I'm still getting to grips with the detail.
"What is clear is there is a breach of the Covid-19 guidelines. The whole squad have really followed that to the letter. I'm not going into any more details until I'm aware of everything."
"We've spent a long time putting the guidelines in place, and the whole squad have followed that to the letter.
"We've had four tests in the period we've been together, our staff have done an incredible job of keeping it secure and tight, which was so important both to get the games played and also for the safety and security of our team and staff.
"So in that respect we have no alternative but to do what we are doing."
Asked whether there is a question mark over whether the match in Copenhagen will still go ahead, Southgate said: "We are very clear that no other members of our party have been in contact with those two players.
"That's why they couldn't go to breakfast this morning or join us for training. We are very clear we have followed all the guidelines in that regard.
"It's a very serious situation and we have treated it that way and acted as quickly as we have been able to."
Former England goalkeeper Peter Shilton questioned the discipline under Southgate when he tweeted: "Are the cracks starting to appear with the discipline in the England camp on the pitch and off it with Walker getting sent off in ridiculous fashion for a second silly challenge and Foden /Greenwood with off the field COVID breach!"
However, Southgate – who called the pair "naive" – also refuted suggestions that players may feel they can flout the rules because he gives them plenty of leeway.
"I think we like to have a good relationship with the players, but the players that have worked with me for a long time know I'm not afraid to make tough calls, so no, I don’t agree that is the case," he replied when he was asked if players may see him as a 'soft touch’.
"I don’t think I can be responsible for discipline when players are not with us. We then have to make decisions on how we approach it.
"I think whenever there have been issues, whether it’s been as an Under-21 coach or senior coach, we’ve dealt with them internally, so I think we’ve been very strict and firm."
Foden later issued an apology on Twitter for his actions, writing "I apologise to Gareth Southgate, to my England team-mates, to the staff, supporters and also to my club and my family.
"I am a young player with a lot to learn, but I am aware of the huge responsibility I have in representing Manchester City and England at this level. On this occasion I made a poor decision and my behaviour didn't meet the standards expected of me.
"I breached Covid-19 protocols put in place to protect myself and my England colleagues. As a consequence I will now miss the opportunity to travel to Denmark with the squad, and that hurts.
"I will learn a valuable lesson from this error in judgement and I wish Gareth and the team good luck this week."
Denmark manager Kasper Hjulmand and star turn Christian Eriksen were both are unsure whether tomorrow's game would go ahead.
"I only got the information stepping into the press conference so I didn’t hear about what happened exactly, I didn’t hear about how the bubble was broken and what the consequences could be," Hjulmand said.
"To be honest, I haven’t thought about it. So, I guess in the next minutes, hours I’ll know a little bit more.
"But I think it’s very important that we stay in the principles, in the protocols that we have been given.
"It’s about football and the survival of football. I think that we are able to play is very important.
"There’s been a lot of things going on so we can actually play these matches, so we have to be focused and live up to the protocols.
"It’s not a good situation. It’s not a good situation. The Danish FA, DBU, will take care of this situation. We have our security manager, we have our people, our sports director, who would of course look into it.
"I think the protocols are very strict and I think UEFA are very strict. We, for sure, will accept whatever UEFA comes up with.
"If they think it’s a good idea to keep going, of course we’ll see and we hope we can play this game, of course."
Former Tottenham attacking midfielder Eriksen echoed his manager’s sentiments ahead of the Nations League clash in Copenhagen
"I think like our coach said, if they haven’t been with the team afterwards obviously and everyone’s getting tested like we are then I hope that all the restrictions that have been made are under control and then we can play the game," he said.
"But obviously if they’ve been hanging around ever since they saw someone outside the bubble, it’s a different story.
"But (from) what we know so far, I don’t know what’s going to happen."