Middlesbrough manager Gareth Southgate apologised for the actions of defender Emanuel Pogatetz after seeing his side lose 3-1 at Manchester United in the third round of the Carling Cup.
Pogatetz was shown a straight red card during the second half at Old Trafford for a dreadful challenge on Rodrigo Possebon, who was left with a suspected broken leg.
After the loss Southgate had no complaints about the decision of referee Andre Marriner to dismiss his player.
He commented: "We can have no complaints about the decision.
"It is difficult to know why it happened. It was an unusual aberration for him, because his discipline has improved in the last two years.
"A couple of lads on our bench did not have the same view as I did but that is dealt with now. We can only hope the lad recovers."
United boss Sir Alex Ferguson accepted Southgate's apology for Pogatetz's actions at full-time, having been upset by some of the Boro bench at the time of the incident.
He said: "The thing that gets me about challenges like that is that the opponent always claims he has done nothing wrong.
"He (Pogatetz) should have just walked off the field. Then you get their bench screaming that is wasn't a sending-off and there is nothing wrong with our player.
"After the game Gareth Southgate was very good about it. He apologised and understood the gravity. It was an absolutely terrible tackle."