No penalty, but quite stupid and unnecessary nonetheless. If you look at the video you can see Mascherano and Messi looking confused at what Arda did
If he had tried to take the ball, okay, but the guy just outright kicked Marcelo when he was told not to do anything like that.
Every team in the World knows how dangerous Real Madrid are on set-pieces in the final minutes of a game so there was a reason for Lucho telling Arda not to foul anyone. Obviously the shambolic marking didn't help either. Masche marking Ramos. Not sure if it was a masterplan by Unzue or the players just forgetting what their job was.