Newcastle boss Eddie Howe insists Fabian Schar was set up for his red card in yesterday's win against Southampton.
Schar clashed with Ben Brereton-Diaz before the Saints striker went down theatrically.
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Howe said: "I think it's really harsh on Fabby, although I think we all know that you can't give the referee the possibility to even give the red card.
"It looks like he has been caught by a well-managed situation. It's something we'll learn from."
Howe added: "In a strange way for us, the red card was a turning point negatively in terms of control, but a turning point in terms of getting the crowd in the game. They felt an injustice. Without that support it's probably a different result."