"We couldn't get the ball and there was nothing in attack from us," Suarez told reporters. "I have to admit that we were bad and we all have to take account of what happened."
Costa Rica, who reached the World Cup quarter-finals in 2014, failed to record a single shot on goal against Spain and now face Japan and Germany in their remaining Group E games.
"We are worried that the group won't get out this hole that we are in," Suarez, who is Colombian, said. "I hope that we can short things out and start working from tomorrow before Japan."
Suarez was appointed to coach the national side in 2021 having previously led Ecuador and Honduras. He included several veterans of past Costa Rica campaigns in his squad for Qatar.
Check out the game summary from a terrible day for the Costa Ricans with Flashscore.
