Officials say Zimbabwe President Robert Mugabe is heading back to Singapore Thursday for medical treatment.
They did not disclose what treatment the 87-year-old is receiving.
Mugabe was in Singapore last month for a check on his cataract following surgery last year.
On Wednesday, he threatened to seize foreign-owned businesses, in retaliation for Western sanctions imposed on him and his political allies.
Speaking at a rally in the capital, Harare, Mugabe made special mention of British-controlled banks and companies. He said there are more than 400 British firms in Zimbabwe, and singled out two British-run banks, Barclays and Standard Chartered.
Mugabe said now is the time to take action against such companies. He also called for a boycott of foreign products.
Western countries accuse Mugabe of driving Zimbabwe to ruin with years of political repression and economic mismanagement, especially the seizure of white-owned commercial farms.
President Mugabe quipped that Western sanctions have crippled Zimbabwe's economy.