Pique allegedly engaged in intimidating behavior towards the match officials during the match between Andorra and Mirandes on Saturday.
According to the referee's report, Piqué, along with sporting director Jaume Nogués and team manager Carles Manso, allegedly addressed the match officials in the dressing room tunnel with offensive phrases such as "you're scoundrels" and "son of a b***h," even prompting police intervention.
The proceedings initiated by the RFEF do not currently entail a direct sanction, but rather aim to clarify the facts and assess whether a full disciplinary file is necessary.
If found guilty, Pique will face a lengthy stadium ban, potentially up to 12 games.
The Segunda Division clash finished 1-1 at Andorra, which sit in fifth place on the Segunda Division table. Mirandes, meanwhile, are 14th.