Observers in the Wroclaw crowd noted that the right-back was the victim of verbal abuse while representing his country against Russia
The Slovan Liberec defender, who was born to a Czech mother and Ethiopian father and is the first black player to represent the central European nation, was on the field as Alan Dzagoev's double and goals from Roman Shirokov and Roman Pavlyuchenko sealed a convincing Group A victory for Dick Advocaat's side.
According to Football Against Racism in Europe (FARE) chief executive Piara Powar, however, the match was marred by the abuse Gebre Selassie received from certain sectors of Wroclaw's Municipal Stadium.
"Our observer reported descriptions of that nature, it was directed at the Czech Republic's only black player," the FARE head explained in declarations published by the Guardian, when asked if the barracking included monkey chants.
Powar also recognised that the abusive chanting was confined to a "small section of the crowd" and doubted whether the reports would be enough to make an official complaint.
"It may not be easy to pull together evidence for a case to be brought."
This is the second instance of alleged racism in little over two days during the tournament, which began on Friday. Members of the Netherlands team complained that they were subjected to abuse from fans that had gathered to watch their open training session in Krakow.