Football Federation Australia would look into the report, a spokesman told the AAP agency.
The AAP said a spectator had racially abused Ifill, an English-born Barbados international, during Adelaide's 3-1 defeat of Wellington at the Hindmarsh Stadium.
"We will investigate the matter," an Adelaide United spokesman was also quoted as saying in the report. (Writing by Sudipto Ganguly in Mumbai; editing by Clare Fallon)
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