Julen Lopetegui's side competed with the Champions League holders throughout the match, taking the game to extra time.
"It's a shame," Navas said at full time.
"The team fought, work hard.
"The attitude was good.
"They had chances in the second half [but] we kept trying.
"It wasn't to be."
"We have to pick ourselves up," Navas continued.
"It wasn't to be.
"The team had its chances.
"We weren't able to get that [winning] goal and they made the most of the chance they had."