Millwall goalkeeper Liam Roberts has had his suspension for a high-footed challenge on Crystal Palace forward Jean-Philippe Mateta extended to six matches, the FA said on Friday.
Roberts dashed out of his goal to deal with a forward pass in the sixth minute of Saturday's FA Cup fifth-round tie and collided with Mateta, kicking him in the head.
Referee Michael Oliver showed a yellow card but upgraded it to red after watching a VAR review of the incident.
Palace chairman Steve Parish described it as the most reckless challenge he had ever seen.
Roberts was handed a three-match ban for serious foul play, but the FA submitted a claim to increase the suspension, saying standard punishment for the offence was "clearly insufficient".
The FA's claim was upheld by an independent regulatory commission.
"The FA claimed that - in the circumstances - the standard punishment for this offence was clearly insufficient, and Liam Roberts subsequently denied this," the FA said in a statement.
"Following a hearing, the Regulatory Commission upheld The FA's claim, set aside the standard three-match punishment, and instead imposed a six-match ban."
Mateta received 10 minutes of treatment on the pitch before being taken to hospital with a severe laceration. The French forward needed 25 stitches in his left ear.
In a statement posted on Millwall's website, Roberts said he had spoken with Mateta and apologised for the incident.
"I am devastated by what happened. I unequivocally accept the red card as awarded and accept my punishment," Roberts added.
"Furthermore, it has been extremely unpleasant to observe suggestions that I intended to harm a fellow professional. I have categorically never stepped onto a football pitch with the intention of hurting anyone.
"Misleading articles and comments have resulted in an unthinkable amount of abusive messages and threats towards my family and I."
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