The chief executive of Derby County football club has criticised fans who "brought shame" on the club after Nottingham Forest defeated the Rams on Saturday.
Sam Rush has apologised after fan appeared to run on the pitch and aim a punch at Reds defender Kelvin Wilson and the Forest chairman Fawaz Al-Hasawi's car was vandalised.
Mr Rush said Derby County were building a club which is built on "strong principles" and acts "with class at all times" but that actions of some fans had brought that into question.
He said: "Our success is very much influenced by our style. Creating an environment which attracts good players, staff and fans is critical. How we conduct ourselves, both on and off the pitch, has a direct bearing on this.
"The events which unfolded, following our disappointing result against our local rivals on Saturday, have brought shame on our club. Even the Derby Telegraph, carried on Monday morning the title "Disgraceful".
"I know that the vast majority of Derby fans are equally appalled by the callous act of a thoughtless individual seeking to attack a player on the pitch and similarly those who chose to vandalise the Forest Chairman's car after the match.
"We can only apologise for those individuals who mistakenly call themselves Rams fans. To these people Derby County Football Club will not tolerate this type of behaviour, under any circumstances. We will seek to permanently exclude from our club anyone who thinks this is even close to acceptable."
Police arrested a 23-year-old Derby man in connection with a pitch invasion at the iPro stadium.
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