Neville says De Gea's effort wasn't good enough.
"You canâ€™t do that," said Neville. "They are big, big moments. That punch there has cost his team.
"Heâ€™s got to clear it out of his box, take everything with him. Weâ€™re talking about playing for Manchester United and trying to win a championship. Youâ€™ve got to punch that 15 or 20 yards away.
"Schmeichel, Van der Sar, heâ€™s got to get to that level. He knows (that heâ€™s made a mistake)."