Presidential spokesperson Amos Chanda told reporters at the Kenneth Kaunda International Airport that Lungu has gone to Kenya at the invitation of his counterpart, Uhuru Kenyatta.
He said Lungu will hold private talks with Kenyatta and will return over the weekend.
Meanwhile, the spokesperson said it was unfair for civil society organizations to call on Lungu to take action on a report released by the Financial Intelligence Center on the loss of millions of funds through tax evasion, money laundering, fraud and corruption.
He said it was unfair for the organizations to call on Lungu to take action when he has not been availed with the report and has just been reading about it on social media.
On Tuesday, 11 civil society organizations called on Lungu to come up with a roadmap on ending continued abuse of public resources following the release of a report by the Financial Intelligence Center, which revealed glaring abuse of resources.
According to the latest report, Zambia incurred losses in 2017 linked to financial crimes such as corruption and tax evasion, amounting to 4.5 billion Zambian Kwacha (about 450 million U.S. dollars).