The Arsenal defender is in defiant mood heading into the quarterfinal showdown against Vicente del Bosque's reigning European champions
France goes into the clash as underdog after a 2-0 capitulation against Sweden on the final day of Group D action, but the 26-year-old is adamant the setback will hold no weight on the team as it prepares for the upcoming match.
"It will be a stimulating challenge playing against the defending champions," Koscielny told assembled reporters at a press conference.
"We have nothing to lose. I do not see why we would have to fear them; rather we should be taking fun from it.
"I think that Spain resembles the current Barcelona team. I know Fernando Torres well because I have played against him in England.
"Nevertheless, they are a collective team. He will not be their only threat, but we will prepare ourselves to be there on Saturday."
The daunting task of keeping the Spanish forward line quiet will fall on Koscielny's shoulders, especially as Philippe Mexes will be suspended for the encounter.
"I feel good physically. Mexes' yellow card [against Sweden] was unfortunate, but we must ensure the defense continues calmly.
"The game against Spain will be a great chance to prove I deserve my place on the field."