VIDEO: What are you doing, Casemiro? Man Utd midfielder buckles as Michael Olise fires Crystal Palace to four-goal lead in embarrassing defeat for Erik ten Hag's team

After Olise had already embarrassed Casemiro to fire Palace into the lead in the first half, he continued to pile the misery on Manchester United. The Brazilian was attempting to shield the ball out of play for a goal kick near the corner flag, but Daniel Munoz picked his pocket to keep it in play. He then pulled the ball back to Olise, who swept it in from the edge of the box.

Giving his verdict on the fourth Palace goal, Smith said: "I mentioned humiliation a while ago and we're seeing it now…big, bold letters. Casemiro, what is doing over by that byline?"

The one-sided score-line led to chants of "Sacked in the morning" from the home fans inside Selhurst Park, aimed at under pressure United manager Erik ten Hag, for whom there were already no guarantees of keeping his job next season.

United face a genuine struggle to qualify for any European football next season. They currently sit eighth. Winning the FA Cup final on May 25, for which Manchester City are overwhelming favourites, would mean automatic Europa League qualification, regardless of their Premier League finish.