Zamalek president Mortada Mansour has threatened to ban a group of fans who formed themselves into the shape of an "angry face" emoji inside the club's stadium.
The stunt was organised in protest at the Egyptian side's failure to reach the knockout phase of the African Champions League.
Dressed in black, instead of their usual white, about 150 supporters spread themselves across a stand to create the emoji during the team's 4-3 win over Sudanese club Al-Merriekh.
But Mansour was distinctly unimpressed.
"Zamalek wears white with two red lines," said the 70-year-old, who is a controversial figure in Egyptian football and recently served a one-month prison sentence for verbally insulting the president of bitter Cairo rivals Al Ahly.
"Whoever wants to support us is welcome, but not in black. Those who went to the Al-Merreikh match in black will not be allowed to attend again."
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