Cardiff face being without Craig Bellamy for a critical period of their battle for Premier League survival after the striker was charged with violent conduct by the Football Association.
The incident was not seen by referee Andre Marriner, and an FA statement read: "Cardiff City's Craig Bellamy has been charged by The FA for violent conduct following an incident which was not seen by the match officials."
Bellamy has until 6pm today to respond to the charge. Should the former Wales striker choose to accept it he will face a three-match ban and miss home Premier League meetings with Aston Villa and Hull, either side of this weekend's FA Cup clash with Wigan.
Cardiff sit 19th in the table and, with an inferior goal difference to the sides above them, are effectively four points from safety ahead of today's clash with the Villans.
The decision is unlikely to have impressed Bluebirds manager Ole Gunnar Solskjaer, who accused De Guzman of over-reacting.
The decision to charge Bellamy came after a three-man panel of former elite referees reviewed footage of the clash and agreed unanimously that it constituted violent conduct.
But, speaking prior to the FA charge, Solskjaer claimed there was no need for action to be taken.
He said: "For me it was absolutely nothing. If that was me going down like that, my dad would have had something to say.
"But then again you can look at (Angel) Rangel when he kicks (Wilfried) Zaha in the first half. Nothing is mentioned about that. But that's just football."