Croatia coach Slaven Bilic said some of his players let the occasion get to them as they toiled to a 1-0 win over Austria in their Euro 2008 opener.
His side had to hang on for long spells after Luka Modric's fourth-minute penalty had given them the lead.
Austria piled on the pressure but just failed to snatch an equaliser.
"Some players were overwhelmed by playing at a great tournament but we started off with the best possible way - with a win," said Bilic.
"In the first 35 minutes we played excellently, of course the early lead contributed to that.
"They exerted more pressure in the second half and I'm sure that is not to do with a lack of strength from our players. But we confined ourselves to our penalty area too early.
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