Costa Rica are expected to make an early exit in Brazil after being drawn against four-time champions Italy, dual winners Uruguay and England in Group D.
But Rosenborg defender Gamboa says his team-mates will not be overawed when they face the likes of Luis Suarez, Mario Balotelli and Wayne Rooney at the showpiece event.
"When we found out, we really couldn't believe the group we ended up in," the 24-year-old told FIFA.com.
"But you have to grow up at the World Cup. This is the biggest stage.
"If we get our foundations right and if we focus on the methods that got us to Brazil, there's no reason we can't look the likes of Suarez, Balotelli and Wayne Rooney right square in the eyes.
"It's 11 on 11 and names don't always mean a lot on the pitch."
Jorge Luis Pinto's men qualified for the World Cup finals on the back of a resilient defensive structure.
"Our defence is key," he said.
"It's not like the old days of free, open football. We've been drilled.
"It's been hammered into us. Every game, every training session. We stay tight and we break."
"Defence got us through the qualifiers and it's part of us now but I won't give the impression that we're only defence," said Gamboa.
"We're not a desperate team. We break out fast, and when we do, we have some top players."
