The top judge said he would continue to serve after he turns 66 on Oct 1.
Arifin said the other two are Court of Appeal president Raus Sharif and Chief Judge of Malaya Zulkefli Ahmad Makinuddin.
Raus will retire in February while Zulkelfli the following month.
The Federal Constitution empowers the king to allow judges to serve another six months.
Arifin said he would, among others, use the extended period to work out a succession plan.
“But of course it will go through the Judicial Appointments Commission and I can’t tell you who will succeed me,” he told reporters after opening a law conference here today.
In a related matter, Arifin said retired Federal Court judge Jeffrey Tan Kok Hwa was appointed additional judge due to his experience.
“But his appointment has not deprived a judge from the Court of Appeal to be elevated to the Federal Court,” Arifin said, adding he could appoint more additional judges if there was a need for it.
A maximum of 15 Federal Court judges could be appointed but there was no limit on additional judges.
He said the apex court needed more judges because there were more occasions calling for a five- or seven-man bench to dispose of cases.
Moreover, he said the Court of Appeal was busy disposing a lot of cases and judges there were needed to write grounds for their judgments.
FMT last week reported that Tan was made additional judge effective July 1 for two years but the judiciary had not stated the rationale behind such an appointment.
Tan is the second retired judge to be appointed to that position, the first being Federal Court judge S Chelvasingam MacIntyre in the late 1960s.
Article 121 (1A) of the Federal Constitution allows for such an appointment.
It states that the king, acting on the advice of the Chief Justice, may appoint for a purpose or for a specific period, a person who has held high judicial office to be an additional judge of the apex court.