England players have been banned by the Football Association from having nights off while on international duty.
Wayne Rooney apologised after pictures showed him at a wedding that night.
Meanwhile, the Sun claims up to 10 other players were at a nightclub drinking until 04:30 GMT on Sunday.
A statement issued on behalf of England captain Rooney, who had attended a wedding at the team’s hotel, said: “Naturally Wayne is sorry that pictures taken with fans have been published.
“Although it was a day off for the whole squad and staff, he fully recognises that the images are inappropriate for someone in his position.”
The FA, whose decision is not prompted purely by Rooney’s night out, is not expecting to discipline anyone.
England’s players, who will still have free time but not whole nights off, all reported back at 11:00 GMT on Sunday as they were instructed to, and attended training in the afternoon.
‘All the legends you admire drank like devils’
When asked about the Rooney story, Liverpool manager Jurgen Klopp said he did not see a problem.
“I feel sorry for the players,” he said. “We live on the sunny side of life, but in the end maybe it is a surprise there is a human being behind the kid.
“This generation is the most professional generation of footballers we have ever had – not only in England. All the legends you admire, they drank like devils and smoked like crazy and were still good players. Nobody does that any more.
“I’ve no idea where Wayne was but I’m pretty sure it was not that serious.”
‘He’s suffered the consequences of the social media world’
Scotland and West Brom captain Darren Fletcher defended his former Manchester United team-mate in an interview with BBC Radio 5 live.
“The whole situation is very unfortunate,” said the midfielder, 32. “I hear a lot about how professional footballers are detached from the public and they don’t mingle any more. This circumstance shows why professionals are scared to do it. He’s suffered the consequences of the social media world we live in. Players will be even more guarded now.
“People plaster you all over social media when you’re kind enough to take pictures with fans.
“He holds his hands up. It’s been blown out of proportion. That’s not me defending my friend, Wayne Rooney, that’s me defending most footballers who like to let their hair down. He’s made a mistake but a genuine one in terms of trying to give a bit of time to fans when he was a bit worse for wear.
“He’s the most down to earth guy you’ll ever meet. If he gets the chance to socialise with normal people and his guard is down, he’s probably let the guard down too far. He’s almost been too approachable and down to earth.”