"If I am here it's not because I bought a lottery ticket," Navas told a news conference on Tuesday after passing his medical, signing a six-year contract and being presented to fans at the Bernabeu stadium.
"I feel capable of taking on these challenges," added the 27-year-old, whose performances at the World Cup prompted the world's richest club by income to lure him to the Spanish capital for a reported fee of 10 million euros (10.01 million pounds).
"My work is my foundation and when you work hard you feel ready to take on any kind of challenge.
"I am very calm. What I have to do is train hard and be available to the technical staff and when I get my chance be ready for it."
The arrival of Navas has created something of a headache for Real coach Carlo Ancelotti, who is now spoilt for choice for keepers with three top-class performers vying for a place.
Casillas was first choice in the Champions League and the King's Cup last season, while Lopez, whom Spanish media have said may de discarded, played in La Liga, continuing an awkward rotation policy begun under Ancelotti's predecessor Jose Mourinho.
Navas said Casillas, 33, and the 32-year-old Lopez had been an inspiration to him during his career.
Known as the "Falcon of Costa Rica" for his agility, Navas spent his first year in Spain playing for second-division Albacete before Valencia-based Levante came calling in 2011.
"I think they (Real) will have more choice now," Navas told reporters.
"The best in the world are at Real Madrid and I hope everyone will feel comfortable and there will be nothing negative."
(Writing by Iain Rogers, editing by Justin Palmer)
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