The phrase "a possible substitute for" is correct and usable in written English.
You can use it when discussing alternatives or replacements for a particular item, concept, or method.
Example: "In this recipe, olive oil can be a possible substitute for butter if you're looking for a healthier option."
Alternatives: "an alternative to" or "a replacement for".
Researchers from the Energy Department's Ames Laboratory, in Ames, Iowa, are working with cerium as a possible substitute for neodymium.
It is viewed as a possible substitute for public assistance or as an alternative to family allowances.
In this paper, experimental results on the performance of liquefied petroleum gas (LPG) as a possible substitute for refrigerant R-12 in domestic refrigerators are presented.
Nuclear energy has been experiencing a revival in many countries, since it is considered to be a possible substitute for fossil fuels for electricity generation.
For instance, when laser vision-correction surgery emerged as a possible substitute for eyeglasses, the Luxottica Group, the maker of luxury and sports eyewear brands like Chanel, Prada and Ray-Ban, chose not to participate.
Lord Turnbull, the former head of the civil service, has been proposed as a possible substitute for Andrew Tyrie, the Conservative chairman of the Treasury select committee, who has been asked by the government to lead the inquiry.
The use of wood-based connectors as a possible substitute of metal fasteners, for specific applications, in modestly loaded and moderately dense timber components, in new timber assemblies as well as for restoration works, is discussed.
The study opens a possibility for LMR NMC cathode material which has almost double the capacity of currently used cathodes, can be a possible substitute cathode for LIBs used in electric vehicles.
As a result of the rising energy needs and environmental concerns, carbonized briquettes have been looked at as a possible substitute source of energy for charcoal in most of the developing regions.
In the service's homeless relocation program, meanwhile, Ms. Garcia-Figueroa is preparing a list of her clients' needs for a possible substitute.
She appeared to find it extraordinarily beautiful to listen to, rather as if it were the best possible substitute for the primordial silence itself.
