In his acceptance speech following Tuesday's run-off election in capital Monrovia Saturday, Weah said in the next few days he would set up a government committed to delivering on promises made to the people.
Immediately after NEC chairman Jerome Korkoya read the final results, Weah's party headquarters erupted into celebration.
Buhari says Nigeria is ready to work with Liberia on issues of mutual interest and called Weah's victory "an affirmation of the will of the Liberian people to remain united, peaceful and prosperous".
Senator George Manneh Weah, President-elect of the Republic of Liberia has praised President Ellen Johnson Sirleaf and the worldwide community for his ascendancy as president of Africa's oldest republic, Liberia, and also bragged of his government's commitment to continue the works of his precursor.
The former FIFA World Player of the Year played with AS Monaco and Paris Saint-Germain, among others.
"The successful election that will not only see to the historic transfer of power from one democratic government to another in Liberia in about 73 years, but also the transfer of power from a ruling party to the opposition, is a giant stride for democracy and stability in Liberia and the entire West Africa".
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"I have known him for a long time and I know presidency won't change him".
Early, President-elect Weah whose posture today appeared presidency, with is Vice President-elect Jewel Howard seated on his left hand side with glaring smiles during the conference, also used the occasion to pay tribute to those who lost their lives in the cause of the CDC, stressing, "I want us to use the occasion to call on all of us here today for a minute of silence in remembering of those Cedecians who lost their lives in the cause of our revolution".
Joseph Boakai in an address to the nation on Friday is offering to help Weah's new government if needed.
Weah, a former FIFA World Player of the Year and Ballon D'Or victor, will succeed Ellen Johnson Sirleaf in the Liberia's first democratic transition since 1944.
The 51-year-old Weah, a senator who entered politics more than a decade ago, will take over in January.
Vice chairman of the MTN FA Cup Committee, Kofi Poku has given the clearest indication that former Ballon d'Or victor; George Oppong Weah deserves to be the president of Liberia. She led the country from back-to-back civil wars and saw it through a deadly Ebola outbreak.