The Midlands club had a tough game against Bournemouth in the Premier League, winning 3-1 after being 1-0 down.
McGinn played a loose pass that was cut off and left his team vulnerable when they were 3-1 up.
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He did go on to win the ball back, while apologizing to an angry Emery on the touchline.
During a post-game interview, Emery saw McGinn and slapped him on the back, stating: Super John McGinn! He's not always, but he was today!"
McGinn did admit he was not at his best in their previous game in the Europa Conference League against Lille, which they won on penalties.