South Yorkshire Police are looking into complaints against Sheffield United goalkeeper Paddy Kenny.
Kenny has been reported for alleged behaviour towards the end of The Blades' 3-2 victory over Yorkshire rivals Hull City on Saturday.
David Unsworth's late winner for Neil Warnock's side sparked celebrations from both the players and fans, with Kenny's behaviour reportedly going over the top and sparking trouble with the supporters.
"Complaints have been raised from Hull City fans that the goalkeeper made gestures towards them as his team scored a late goal to win vital points in their race for promotion to The Premiership," a police statement read.
Superintendent Martin Hemingway, head of the Sheffield Football, Events and Licensing Unit, added. "A number of complaints have been received and officers are looking into them.
"We need to get a full picture of what is alleged and gather the available evidence.
"There is no doubt that events on the field affect the behaviour of spectators and allegations of deliberate taunting are always taken very seriously."