Jose Breton, whose 2-year-old son and 6-year-old daughter disappeared last year, said through his attorney that if the remains turn out to be human they are not the same ones collected after the children first went missing, thinkSpain reported.
Breton's lawyer, Jose Maria Sanchez de Puerta, said the discovery was initially identified as animal remains.
The remains are currently undergoing tests at the University of Santiago de Compostela in an effort to extract DNA, the lawyer said.
He also said the chain of evidence must have been fractured.
Breton is currently in jail awaiting psychiatric tests ordered by the defense.
His lawyers have requested a bench trial.