Buenaventura left late Tuesday night to attend the spring meeting of the International Monetary Fund (IMF) in Washington, but told reporters that he would not return until shortly before the May elections.
Buenaventura said he would undergo medical check-up in the US after the IMF meeting as part of the continuing treatment and monitoring of an old and unspecified thyroid problem.
"Ill be back maybe before the elections, depending on the results of the tests," Buenaventura intimated. "Wish me luck."
Buenaventura is the most-watched member of the governments economic team and has been primarily responsible for reining in the BSPs monetary policies to keep interest rates and foreign exchange rates under control and in line with the BSPs inflation targets.
According to Buenaventura, Reyes would take over as acting governor during his absence, assisted by deputy governors Amando Tetangco Jr. and Armando Suratos.
Reyes is currently the head of the BSPs bank supervision department that monitors bank compliance with the BSPs banking rules and regulations.
Buenaventura also went on medical leave for at least a month last year during which he was ordered suspended by the Court of Appeals in the case involving the closure of the defunct Urban Bank of the Philippines (UBP).
The suspension order is still pending resolution by the Supreme Court.
Buenaventura will be accompanied by wife Marivic Rufino.
Buenaventura has departed just as the peso has started recovering from its record-breaking slump that sent the currency to historical lows.
Buenaventura, however, said the currency should remain stable even in his absence since the political turmoil appears to have abated close to the May elections.
Before Buenaventuras departure, market analysts had commented that his absence could be used as an excuse to drive the peso down all over again. "When the cat is away, the mouse will play," analysts said.