The Coatbridge champion was due to make the third defence of his belt against the fighter ranked 14th in the world, who was himself a late stand-in for Liam Walsh, who was injured in a car crash.
However, promoter Frank Warren had it confirmed today that Ocampo has also dropped out of the bout at the ExCel Arena in Docklands although the reason is not yet clear.
While the search for a new opponent for Burns is under way, a spokesman for Warren said: "Ricky's opponent pulled out this afternoon [Monday].
"But Ricky will still be fighting on the show as planned and we are looking for a replacement now."
The 29-year-old Scot, whose last outing was a fourth round stoppage of Dagenham's Kevin Mitchell at Glasgow's SECC in September, is aiming for a unification fight with WBC champion Adrien Broner.