England got Roy Hodgson's tenure off to a winning start with a hard-fought 1-0 win over Hangeland's Norway in Olso on Saturday.
However, Fulham stopper Hangeland fears England's chances in Poland and Ukraine could be hampered by fatigue from a hard Premier League season.
"It's a good England team, but they look a little worn out after a long Premier League season," admitted Hangeland.
"I felt the same thing. It's not a good preparation for the Euros to play such a long and tough season as you do in England.
"Even if it was a friendly you could see that the English players need a break."
Hangeland admits he was shocked to see Norway have so much possession against England and believes they will be punished at the Euros if they allow their opponents so much time on the ball.
"It's unusual that a Norwegian team has so much possession," added Hangeland.
"Normally we play defensively and wait for the opponent to make a mistake, but it was the other way around.
"We caused England problems when we played the ball quickly.
"If you play the ball quickly from right to left and from left to right, you get opportunities for crosses.
"Sweden have a good chance against them at the Euros because they have Zlatan Ibrahimovic, who can do something with all those crosses."
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