Huddersfield have handed an indefinite ban from the John Smith's Stadium to the man who unfurled a Turkey flag during Sunday's Sky Bet Championship game against Leeds.
The Terriers have confirmed a 59-year-old man was ejected from the ground after appearing to mock the stabbing of two Leeds fans, who died before a match against Galatasaray in Istanbul in 2000.
"Huddersfield Town can confirm that a 59-year-old man was ejected from the John Smith's Stadium Revell Ward Stand at Sunday's game against Leeds United," the club said in a statement.
"The individual has subsequently been banned from the John Smith's Stadium indefinitely.
"Huddersfield Town takes incidents of this nature very seriously and will not tolerate this shameful behaviour under any circumstances.
"This individual is not representative of the club or its supporters."
Leeds fans were left furious when the flag was unfurled during Sunday's derby clash between the promotion rivals.
Christopher Loftus and Kevin Speight died after being stabbed by a local man during street clashes the night before Leeds played Galatasaray in the semi-finals of the 2000 UEFA Cup.
West Yorkshire Police tweeted on Sunday that they had ejected the man responsible for waving the flag and would "be visiting him this week to deal".
Meanwhile, both clubs are waiting to learn whether they face charges from the Football Association following the touchline melee on Sunday, which marred Huddersfield's 2-1 win.
Town head coach David Wagner and Leeds counterpart Garry Monk also face possible charges.
The pair were sent to the stands by referee Simon Hooper for an altercation which followed Wagner's touchline celebrations after Michael Hefele had scored the hosts' dramatic late winner.