"He was confident about taking it and I asked to take it too. But he was confident. He ended up missing it. That could happen to me or any other player, like Jorginho who also takes the penalties," Goal.com quoted Willian as saying.
Barkley missed the penalty in the 87th minute. Rodrigo scored the only goal in the match in the 74th minute, handing Valencia a victory.
Willian said that they expected a positive result.
"We expected a positive result. We expected to start at home with a victory, but unfortunately we lost it. We have five games left to qualify. I think we have a chance, of course," he said.
"We have to improve and we have to keep our heads up and keep working. We have everything in front of us," Willian added.