Eriksson confirmed that the England players' had last night asked if they could visit Auschwitz. He explained: "I don't know if the word 'rich' describes the feeling but it was an experience."
Not all the players made the trip but some had already been there on a previous visit with the England Under-21 squad.
The Swede denied his players lacked a strength of character, highlighted by conceding winning positions last Saturday and against Portugal and France at Euro 2004.
"I never had a football team who were perfect for 90 minutes and I doubt you will find it," he said. "We're not perfect, unfortunately, and we will never be perfect but hopefully we will do less mistakes and will get better in the next two years."
Steve Gerrard has claimed England are under "massive" pressure to win in Poland, but Eriksson was adamant his team would remain optimistic.
"I should be very surprised if we had one footballer thinking like that (about defeat)," he said. "They are not afraid of losing, I don't think so, I hope not. Of course I think they can win. I think the team spirit is as strong as at Euro 2004."