He took issue with the tough stance adopted by European football's governing body and said: "The FA are doing everything they can to ensure that safety and security preparations are paramount.
"However, the FA cannot be responsible for those fans who have bought tickets directly over the internet. We must trust them to be aware of the responsibility they carry."
The FA have sold tickets to 13,500 England supporters for Sunday's game against France in Lisbon; 6,500 for the match against Switzerland in Coimbra on 17 June; and 16,500 for the clash against Croatia in Lisbon on 21 June.
The size of the FA's task is clear when it is set against police and Home Office estimates that 200,000 English people described as "football-loving tourists" could be in Portugal in addition to the 50,000 supporters expected to travel.
However, Lars-Christer Olsson, UEFA's chief executive, said: "The association bringing fans are responsible for the behaviour of those fans. That includes not only the venue but other places, too."
Speaking about whether England would be expelled from the competition if there was serious trouble, he added: "It has to be decided when we know all the facts, but of course they run the risk."
Eriksson added: "Every team at Euro 2004 have pressures but England are unique in having a UEFA warning hanging over us. It would be a tragedy if events off the pitch denied us a chance of glory."
England flew to Portugal today to prepare for Sunday's game.
Meanwhile, Eriksson says David Beckham will face France on Sunday despite the captain having a cyst removed from his back and suffering with a sore ankle.
John Terry, who has a hamstring strain, also dismissed speculation he is a serious doubt, saying: "I'm hoping that everything will be okay by Sunday."
