Brentford players Ivan Toney and Rico Henry tweeted the allegations against the unidentified supporters after the match at Goodison Park.
“I will do anything for them & whatever it takes to get the small minority punished! This is not acceptable & must be investigated immediately.”
Both Everton and Brentford released statements on Twitter condemning the incident.
“We are assisting Merseyside Police to ensure the individual is identified and dealt with appropriately.”
‘Absolutely no place for hate’
Meanwhile, Brentford said it was aware of the incident and had made reports to both Everton and the police.
“We will offer our support to Rico’s and Ivan’s families and will fully co-operate with the investigation and any subsequent legal proceedings.”
Merseyside Police said it was investigating the reports and would work with Everton to find those “responsible and bring them to justice.”
Brentford won the match 3-2 in a dramatic encounter, with Henry’ second-half header sealing the win as Everton finished the game with nine men.