The Spaniard said he still had belief in his "extraordinary" side.
"The only way to play good football is to be positive," he added.
"To go through you have to make the perfect game, create chances and concede few chances. The chances we receive, we have to defend well.
"We have 90 minutes and anything can happen. All we are going to do is try.
"We have 90 minutes plus extra time and what we have shown this year - even in the last game - is we can create a lot of chances in the last few minutes."