Navas reckons they are not the same team that stormed to Champions League success in 2011 - even if they are still top dogs in Spain.
He said: "It's hard to say [if they are as strong as they were] because they set the standards so high in the past.
"It is very, very difficult to keep playing with that kind of style year in and year out.
"But, that said, they are top of La Liga and they are in the final of the Copa del Rey.
"We have been training hard and hopefully by preparing this match well we can go through to the next round. We are full of confidence."