Barcelona great Luis Suarez was left underwhelmed by yesterday's victory over Levante.
After the 1-0 triumph, Barca coach Ronald Koeman declared they were still title contenders this season.
But Luisito told Carrusel Deportivo: "The team has had good opportunities, they have been able to score before, but even on those occasions it shows that they are not in a good moment.
"They are not fine in the completion. Barcelona plays on impulse, lazy, makes defensive mistakes. Luckily the goalkeeper is okay.
"You have to improve a lot if you want to win. You have to wake up because it will cost you a lot if you do not improve. Barça makes childhood mistakes."