Valverde admitted that Luis Suarez's wondergoal took him by surprise from the dugout.
The Uruguayan striker bounced the ball past Manolo Reina with a backheel to score Barcelona's fourth goal of the night before half time.
"The situation took me by surprise," Valverde told the press afterwards.
"I thought it was a pass to a teammate.
"It surprised me, but it was an extraordinary goal.
"I told him that there had been a few easier chances and this one, which was improbable, went in."
Lionel Messi scored a hat-trick of outstanding finishes of different types and Valverde thought it was a fitting performance.
"It was a good way to celebrate the Ballon d'Or," he said.