Lebanon has named its envoy to Germany, Mustapha Adib, as the new prime minister to steer the country through a deep crisis after the Beirut explosion compounded a sharp economic downturn.

The presidency made the announcement in a televised statement as Mr Adib arrived at the palace in Baabda near Beirut to meet President Michel Aoun and parliament speaker Nabih Berri. 

Mr Adib has been Lebanon's ambassador to Germany since 2013 and his name only emerged yesterday to replace Hassan Diab, whose government resigned in the aftermath of the deadly 4 August blast at Beirut port.

The 48-year-old was born in the northern city of Tripoli and is a Sunni Muslim, making him eligible to become prime minister under Lebanon's sectarian-based power-sharing system.

He vowed to swiftly launch a reformist government and seek international financial assistance after the Beirut blast.

In a televised speech after his nomination, Mr Adib said there is "a need to form a government in record time and to begin implementing reforms immediately, starting with an agreement with the International Monetary Fund".