Salisbury have reported an allegation of racist language to Wiltshire police after an incident during their FA Trophy win at home to Hayes & Yeading.
It is alleged Hayes & Yeading striker Elliott Buchanan was subject to racist abuse while receiving treatment.
Hayes & Yeading have contacted the Football Association, who the club say will be investigating the matter.
“If it is found one of our supporters used racist language they will be subject to action,” Salisbury said.
The Southern League Premier Division South side added in a statement: “Salisbury FC is fully committed to doing all it can to assist in the eradication of the use of any racist, sexist or homophobic language.”
The referee, managers and players all agreed to complete the tie, which Salisbury won 4-3 against their fellow seventh tier side.
“The directors, committee and bench of Hayes & Yeading were disgusted to hear racist abuse directed at United striker Elliott Buchanan,” the visitors said.
“A full report of the incident has been made by the match referee, as well as managers, players and officials of both clubs.”