Even with Neymar available, Barcelona is feeling the absence of Lionel Messi.

The team's 0-1 loss at Athletic Bilbao was its second straight setback after a run of 20 unbeaten matches to start the season. Both losses occurred with Messi out injured.

"This Is Not Our Barca!" sports daily Sport headlined yesterday on its front page. El Mundo Deportivo went with "Another Death by Asphyxiation" in reference to Bilbao's relentless pressure, the same tactic that helped Ajax beat the Spanish champion 2-1 in the Champions League last Tuesday.

Barcelona coach Gerardo Martino has tinkered with the team's style of play since he took over this season. At the expense of some of the Catalan club's aesthetically pleasing play of one-touch football, the changes had netted results until last week.

"We're going to lose some games and we're not going to like it, and that will generate all types of questions but we don't have to throw everything out the window. There's no reason to see it all so negatively," midfielder Andres Iniesta said. "We just couldn't score after having occasions and dominating parts of the game."

Barcelona created chances late in the second half on Sunday at the San Mames but couldn't beat Bilbao goalkeeper Gorka Iraizoz. Martino also alluded to Messi's absence being a factor with the team's lack of finishing up front.

"We just couldn't find that last pass to help us finish it off," the Argentine coach said. "What is disconcerting is when a team doesn't know what to do, but I didn't see that my team didn't know what to do."

Bilbao struck on the counterattack. The Basque club's stifling pressure high up the field forced Barcelona's defense into hurried passes and giveaways.

Barcelona saw its lead at the top of the standings erased as Atletico Madrid joined it in first place with 40 points. Real Madrid is three points behind.

The Madrid press reveled in Barcelona's struggles, with sports daily Marca writing "Barca Slides; Madrid Thrives" across its front page.

Real has been on a stellar run since losing at Barcelona last month. The team is unbeaten in seven games and while Cristiano Ronaldo has been spectacular, Gareth Bale has also stepped up. Bale scored a hat trick in Saturday's 4-1 victory over Valladolid with Ronaldo out injured.

Bale's adaptation to the Spanish league has also put Neymar under watch after the pair arrived in Spain.

Barcelona can at least look forward to a Copa del Rey match against third-tier club Cartagena on Friday as a chance to rebound from a difficult week.

"There's no reason to be alarmed," Barcelona midfielder Sergio Busquets said. "We just need to keep moving forward. We have to win all the games we have remaining until the end of (2013) and to learn from our errors and good things we do."