Sweden coach Erik Hamren believes his side were affected by the occasion as they succumbed to a 2-1 loss to Ukraine in their Euro 2012 opener.
Zlatan Ibrahimovic put the Swedes in front shortly after the half-time interval, but two goals from Andriy Shevchenko clinched victory for the co-hosts.
The Sweden boss felt that his players were overawed by the event and was left disappointed that they did not perform to the best of their abilities.
"It feels strange, as it seemed like some players were too affected by the occasion. We did not perform at the level that we are capable of. We did not play as a team. Five or six of our players were far from their best.
"We otherwise started the second half with more positive energy and got the goal that we deserved at that time."
The 54-year-old went on to admit that both goals could have been avoided.
"The goals we conceded looked a bit too simple. We can't keep out all crosses. But there was just one player that we had to keep an eye on. It feels unnecessary the way we conceded those goals."
Sweden now sit at the bottom of Group D and must get something from their next game against England on Friday.