Verratti, 25, received a second-bookable offence in the 66th minute for remonstrating at referee Felix Brych, over what he felt was a foul committed against him.
But his agent Mino Raiola says it's a clear indication of double standards in officiating when it comes to Los Blancos and their five-time Ballon d'Or winner Cristiano Ronaldo.
"It was a harsh decision," Raiola told Gazzetta dello Sport. "Until then, Marco was one of the best players on the pitch. His protest was one of frustration.
"Ronaldo also protested, even blatantly, but wasn't booked. Maybe Marco exaggerated, but his was just the frustration of a player who wanted to do everything possible in order to help his team qualify.
"It was a reaction of instinct and maybe pride. After all, Ronaldo protested several times in a blatant way, yet he was excused, even when he tried to kick Dani Alves.
"One red can't erase everything. Until then, Verratti was one of the stars of the game."