Ronaldo left the Portugal squad after he was an unused substitute for a 2-1 win away to Norway in the Nations League on September 27.
The 41-year-old, who has scored a record-breaking 146 goals in 234 appearances for his country, subsequently issued a near 2,000-word statement saying he withdrew from the squad after a "breach of trust" between him and head coach Jorge Jesus.
The Portuguese Football Federation have now acted, saying in a statement: "Disciplinary proceedings were initiated against Cristiano Ronaldo, by decision of the non-professional section, on October 9, 2026, with the objective of ascertaining the potential disciplinary relevance of the facts reported on October 7, 2026.
"Without prejudice to the automatic preventive suspension to which he was subject until the date of initiation, a non-automatic preventive suspension of the player was determined, and the proceedings were given urgent status.
"The proceedings were sent, on October 10, 2026, to the disciplinary instruction committee of the FPF (Portuguese Football Federation), with publicity excluded until the end of the investigation."
Ronaldo missed Portugal's following two fixtures, wins over Denmark and Norway, which left them top of Group A4 with four straight wins, fuelling speculation his international career could be over.
Jesus left the door open to the veteran forward in a press conference after Sunday's win against Norway, saying: "If he wants to, he'll return to the national team."
Ronaldo argued Jesus had reneged on an agreement about how many minutes he would play but apologised for his actions and accepted he deserved to be sanctioned.
He put his difficulties to one side with a goal for club side Al Nassr on Friday in their 3-0 Saudi Pro League victory against Diriyah.
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