Ahead of the Copa del Rey final against Valencia, the defender says that the players need to take a step forward sooner rather than later and move on from the disappointment.
"When something like that happens, everything or almost everything goes wrong," Pique told El Pais.
"I think people were mentally affected by what happened in Rome because it had happened so recently. It was a mental block.
"They pressed very high, we lacked our usual passing rhythm, and it was very intense. Anfield also played its role.
"It's been hard to lift ourselves up emotionally because the days passed but the loss wasn't forgotten. We have to step forward."