Schar and Ben Brereton-Diaz got into a heated confrontation before the Saints striker dramatically fell to the ground.
Newcastle boss Eddie Howe insists Fabian Schar was set up for his red card in yesterday's win against Southampton. AdvertisementAdvertisementHowe 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."