Moussa Wague, Jean-Clair Todibo and Riqui Puig made league debuts and Valverde was pleased with their displays.
"The three players grew into the game," he said.
"They started a bit nervously due to it being their debut, due to the responsibility.
"Todibo is so fast going forward and in his challenges, even if logically he can still improve.
"Wague and Riqui did great work as well, so we have to be happy."