Lukaku was caught on camera swinging his left boot and making contact with Bong just moments before United scored the winning goal in their 1-0 win at Old Trafford.
Referee Neil Swarbrick confirmed on Monday morning that he had not seen the incident, meaning the FA would refer the case to a three-man panel of former match officials.
It was originally thought that the Belgian striker could face a charge of violent conduct and subsequent three-match ban, meaning he would miss the upcoming Manchester derby.
However, according to the aforementioned source, there was no unanimous decision from the three-man panel, meaning that Lukaku will not face any charges and will be available for United's trip to Watford on Tuesday, then Arsenal at the weekend and the Manchester derby on December 10.