Former President of  Nigeria, Goodluck Jonathan, has congratulated president-elect Nana Akufo-Addo, urging him to immediately reunite a deeply divided country.

The former Nigerian leader who lost in last year's election in his country also hailed President John Mahama's acceptance of the results, saying he displayed maturity and patriotism.

READ MORE: Ghana's opposition candidate 'confident' he's won

In a statement, Mr Jonathan said: “I am immensely proud of the maturity and high patriotism displayed by President John Mahama who has just conceded to Mr. Nana Akufo-Addo,” Jonthan wrote on his official Twitter page.

“Some may erroneously think that President Mahama lost today. Not at all. Not at all. He has gained honour that will never depart from him.

“I congratulate Mr. Nana Akufo-Addo and urge him to immediately begin the process of reuniting the nation of Ghana.

“I also urge him to appreciate the great strides and achievements of President John Mahama when that time comes.

“To accelerate the growth of the economy, all Ghanaian irrespective of political divide should be involved."

READ MORE: Electoral Commission declares Nana Akufo Addo as president elect

Akufo-Addo  secured a decisive mandate in Wednesday's vote over incumbent  Mahama to become the 5th president in the fourth republic.

The Electoral Commission announced late on Friday that Akufo-Addo had secured 53.85% of votes, against his chief rival, Mahama, who received 44.4%.