Barca won 1-0 at Valladolid amid major complaints about their ground.
Pique snapped: "If we want to sell the product outside, we should first see what's at home.
"We're shown in the United States and what is a shame is what happened: the condition of the pitch was deplorable. It is no longer a game, there is the risk of getting hurt, it is shameful.
"I hope that those responsible make decisions because it is shameful."