England manager Roy Hodgson has told his players that they must be on their best behaviour at next month's European Championships.
The 64-year-old pinpointed the actions of England's rugby team in New Zealand last summer as an example not to follow.
"My message to them is a very simple one. Not only do I expect them to behave as adults, I am going to demand it," said the former West Brom manager.
"It's a big responsibility but, if there is anyone who can't take that, then they aren't going to play a big part in my thinking in the future."
Hodgson played no part in deciding that England would stay in Krakow, despite playing all their group matches in Ukraine, but he feels that the inner-city location should make no difference.
"We aren't back at school. These are people who have an incredible public profile and know, every time they step outside their front door, the eyes of the world are on them.
"There are mobile phones with cameras everywhere these days. You can't escape them."
The Football Association will give all players a document outlining the behavioural guidelines.
Hodgson continued: "They should be aware that, if they do anything they shouldn't, they are not only letting themselves down, they are letting us all down because the criticism will pile upon us all.
"When you accept the invitation to go and play, you do so on the basis that for four weeks it's football, football, football. There is only a limited amount of training every day and a lot of free time.
"We have gone from one extreme to another by being in Krakow. That wasn't my decision but if you give me a situation where the players can go out, have a cup of coffee and see something else other than their roommates, me and the coaching staff, give me that any day."
England's first game is against France in Donetsk on Monday, June 11.