The Argentinian convinced the referee of his innocence after catching Beckford on the back of the head when spinning around, but the FA could act having seen a replay of the incident.
"Mascherano has turned and put his arm up andit went a bit too high," said Leeds boss Simon Grayson.
"I've looked at replays. I'm not saying it's malicious and I'm not saying it's not, you can't really tell. Some players have been sent off for that, some haven't."
