The phrase "a possible precursor to" is correct and usable in written English.
It can be used when discussing something that may lead to or indicate the existence of another thing in the future.
Example: "The discovery of this ancient artifact may be a possible precursor to understanding the civilization's advanced technology."
Alternatives: "a potential forerunner to" or "an early indicator of".
It was thought that the protein was a possible precursor to disease-fighting antibodies in higher organisms.
Villagers see it as a possible precursor to the environmentally controversial drilling technique known as hydraulic fracturing, or fracking.
Such a vote, which some people in the province consider a possible precursor to secession, might be expected to halt the maneuvers around Caraparicito.
Such cell damage, which is a possible precursor to cancer, was 120 percent higher for refinery workers than for residents of Rayong Province's rural communities.
The convertible comes with two doors, making it a possible precursor to a PT coupe, which analysts expect Chrysler to introduce eventually.
The alliance with Microsoft was announced in February and has been seen by some analysts as a possible precursor to a more extensive relationship between the two companies.
It was the start of a nasty custody battle and possible precursor to all three boys' disappearance last week before their dad's suicide attempt.
En masse, they form a mechanical multitude an order of magnitude larger than any robot swarm ever built a possible precursor to future robot work squads choreographed for chores like construction, cleaning, and search-and-rescue.
En masse, they form a mechanical multitude an order of magnitude larger than any robot swarm ever built a possible precursor to future robot work squads choreographed for chores such as cleaning up oil spills.
The producer and director, Eyal Sivan, has compiled and assembled black-and-white footage of the trial of the SS officer and war criminal Adolf Eichmann, and his film is the grimmest possible precursor to the occasionally frivolous "Court TV," which plays on the current fascination with watching the judicial process grind exceedingly slow, and exceedingly fine.
What has been proposed as a possible precursor of change to a self-management approach is acceptance of some level of pain [ 12].
