The lawyer for a senior opposition politician in Senegal says his client has been charged over comments he made about President Macky Sall.

Birame Souleye Diop was arrested following remarks he made suggesting the president might row back on his commitment not to stand for a third term in next year's election.

President Sall ruled out running for re-election earlier this month, following widespread protests.

Mr Diop is an MP with the Pastef party, whose leader, Ousmane Sonko, was handed a two-year prison sentence in June, making him ineligible to stand in the presidential election due in February next year.