Al-Mustaqbal Movement chief ex-PM Saad Hariri met on Saturdaywith Prime Minister Tammam Salam at the Grand Serail after a series of shuttle presidency meetings over the week.
Hariri left the meeting without making a statement, media reports said.
The National News Agency said discussions between the two men touched on the latest developments.
MTV said that the visit comes in a show of support to the government.
On Friday Hariri had held a much-anticipated meeting with Free Patriotic Movement founder MP Michel Aoun in Rabieh, shortly after he held talks in Maarab with Lebanese Forces leader Samir Geagea.
Since Monday, Hariri has met with Marada Movement chief MP Suleiman Franjieh, Kataeb Party leader MP Sami Gemayel, Progressive Socialist Party chief MP Walid Jumblat and Speaker Nabih Berri.