Costa Rica are based in St. Petersburg for the FIFA World Cup.

"We really like living in St. Petersburg, where the sun shines constantly and there is no night. These are the white nights. We need to curtain the windows to get enough sleep, but we like it here. Anyway, we'll have to leave soon," Ruiz told journalists.

Costa Rica, who lost 1-0 to Serbia in their first Group E match, will face five-time champions Brazil on Friday.

"We respect Brazil, they are a good opponent. But anything can happen in football. We have prepared well mentally to succeed in the upcoming match," Ruiz added.