“It’s a shocking mistake from an international goalkeeper,” Roy Keane told ITV.
“Everton have showed a bit of fight, they have turned it into a cup tie, but that’s carry on football from De Gea.
“It looks like he has had a few drinks, a shocking mistake. It’s almost as if the goalkeeper has been sent off and there’s an outfield player in goal, he just doesn’t know what to do. A horrendous mistake.
“It gives Everton a bit of encouragement, a bit of belief and a bit of life for the supporters.”
De Gea’s error led to Everton’s equaliser. However, Marcus Rashford inspired the Reds to a 3-1 victory.