Phil Foden accepts his behaviour did not meet the expectations required of him as an England player as he apologised for breaching coronavirus protocol rules.
The Manchester City attacking midfielder made his debut in England's 1-0 Nations League win over Iceland on Saturday but was dropped alongside Manchester United star Mason Greenwood for Tuesday's clash in Denmark after breaking rules put in place to ensure player safety.
The pair have had to remain behind in Reykjavik after an Icelandic website published a story where Foden and Greenwood appeared to be shown in a Snapchat video posted by one of the girls they were said to be socialising with.
Iceland's self-isolation rules prohibit such meetings and England boss Gareth Southgate confirmed Foden and Greenwood were unable to train on Monday as a result and would not feature against Denmark.
Foden has made his first public statement since the incident was brought to light and vowed to learn from his error.
"Following the story which has emerged today regarding my actions in Iceland, I want to make a full apology," Foden posted on Twitter.
"I apologise to Gareth Southgate, to my England team-mates, to the staff, supporters and also to my club and my family.
"When I was called up by Gareth for these games, my first reaction was that of immense pride. To pull on that shirt for the senior team in my England debut was an incredible privilege.
"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 judgment and I wish Gareth and the team good luck this week."
Both City and United released statements condemning the actions of their players, while the Football Association said it will fully investigate.
Southgate described their actions as "naive" but was non-committal about how the incident will impact on their involvement with England moving forward.
"I think [to make a call on] those things, it's too early until I have all the information. I don't think I should be making those comments," Southgate told the media on Monday.
"I'm a father to young adults. I know young people get things wrong, we're not excusing that. We've got to assess everything else moving forward."