Nigeria's President Muhammadu Buhari has sworn in the most senior judge at the country’s Supreme Court – Justice Olukayode Ariwoola – as the acting chief justice of Nigeria.

This followed the resignation of Chief Justice Ibrahim Tanko Muhammad due to ill health, and amid allegations from fellow judges of corruption, nepotism and neglect of welfare.

Speaking with journalists shortly after his appointment, Justice Olukayode promised to "protect" and "preserve" the constitution of Nigeria as well as abide by it.

He is expected to hold the post until the president appoints a permanent chief justice which needs the approval of the Nigerian senate.

The chief justice is the head of the Supreme Court and the highest judicial officer in Nigeria.

The Supreme Court hears disputes on various cases including election results. Nigeria is due to hold elections next February to choose a successor to President Buhari.