The Colombian international scored the Gers' equaliser at Tynecastle as the two sides played out a 1-1 draw.
It is alleged that the 23-year-old was targeted as he celebrated his 39th-minute goal in front of home fans housed in the Gorgie Stand.
Hearts have vowed to ban any supporters found guilty of racism.
A club statement read: "The club is aware of the incident in question and is currently investigating it.
"It goes without saying that Heart of Midlothian Football Club utterly condemns any form of racism and any individuals found guilty of such an offence will face an indefinite ban from Tynecastle Park."
The probe comes in the wake of several matches marred by racist incidents.
Yesterday, an FA Cup match between Haringey Borough and Yeovil Town was abandoned after Haringey's players walked off amid claims of racial abuse from fans, while Bristol City are looking into reports of racist language being used by fans during their Championship clash at Luton.
Earlier this week, England's Euro 2020 qualifier in Bulgaria was twice stopped as supporters were warned about racist behaviour while Celtic's Europa League opponents Lazio were hit with a partial stadium ban for the visit of the Hoops early next month after UEFA found the Italian side's fans guilty of racist behaviour in a previous European match with French side Rennes.