Lincoln have made an official complaint after their players and assistant boss Iffy Onuora were allegedly racially abused at Kettering Town on Saturday.
Imps boss Peter Jackson has confirmed he made the complaint to referee Simon Hooper, who will be including it in his report to the Football Association.
Jackson also felt stewards did not act swiftly enough to stop the abuse.
He told BBC Radio Lincolnshire: "How can that happen? He's probably in the pub by now, he's got away with it."
Clearly upset at the abuse, Jackson said after the game: "How could a fellow stood 10 yards behind me call my players monkeys and make monkey gestures? It's totally unacceptable."
Kettering chairman Imraan Ladak said: "As a professional football club if we get any allegations of that nature we will look into it very seriously.
Lincoln City chairman Steff Wright said he hoped it was an isolated incident.
"I think the Football League has put a lot of effort into stamping out racism, and to their credit and the fans' credit it isn't something we hear regularly," he said.
"This was probably one isolated individual, and unfortunately we're all aware that there are plenty of isolated individuals who don't seem to have moved on into the 21st century."
A statement on the Kettering club website confirmed the club were investigating the allegations.
"The club has a strong anti-racist stance and no such abuse will be tolerated," the statement said.
"Anyone found to have committed an act of racial abuse will face a life ban from the ground.
"The club would urge anyone who heard any such remarks to contact the club, even if they are unable to identify the perpetrator(s)."
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