Greece coach Fernando Santos has insisted that his players will not take Costa Rica lightly when they meet in the second round of the World Cup.
The Greeks secured their place in the last 16 on Monday with a dramatic win over Ivory Coast, while Costa Rica drew with England to finish at the top of their group.
While the Costa Ricans have surprised many by their run in the tournament, Santos is confident that his side will be fully prepared to face them this weekend.
"We have time to think about the match with Costa Rica. We will go back to our base, think about it and study our opponents," he told FIFA.com.
"We have to pay a lot of attention to this game, they came out top in the 'Group of Death'. As a result we cannot allow ourselves to underestimate them."
Greece and Costa Rica meet in Recife on Sunday night.
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