"So long as we win our games and score more than the opposition, I'm happy," Hamren told a news conference on Thursday ahead of Sweden's training session on the outskirts of Kiev, where the Swedes will face Ukraine in their opening Group D game on Monday.
Hamren's side conceded three soft headed goals in their last two warm-up games against Iceland and Serbia, but the coach said he did not envisage making too many changes.
"If we only play defensively I can guarantee fewer chances for the opposition - but we'll also create fewer chances going forward," he said.
"That's why we can't get too hung up on the defence - we can do that the day we lose," he said.
The Swedes held an open training session at Dynamo Kiev's training ground, with forward Johan Elmander continuing to rehabilitate his broken metatarsal by training alone.
"My hope is that he'll join the squad tomorrow [Friday] or Saturday," he said.
