"What I'm trying to say, Conan, is that we need each other. You need the warm embrace of your son and I need an easier path through college," Keating said.
Conan issued a firm denial on Wednesday.
"A kid in New Jersey is falsely claiming to be my illegitimate son. For the record, I have three children: Neve, Beckett, and @RonanFarrow," he quipped, in reference to Mia Farrow's recent claims that Frank Sinatra could be her son's father.
Keating told Boston magazine that while he's not positive it's true, it's possible.
"I can't count it out, " he said. "In the video it’s just speculation, but there is this gut feeling that comes into play. Like police detectives. Sometimes you just get gut feelings."
Keating says his mother worked as an employee at NBC's 30 Rockefeller Center when O'Brien was there in the 90s, but was fired when she became pregnant.
"I’m not too clear on that time of her life. She doesn’t like to talk about it," he said.