Vale's (VALE) investor, Previ, has requested a shareholders' meeting to vote on the removal of Chairman Daniel Andre Stieler from the board, according to a Brazilian regulatory filing Thursday.

Previ, which holds a roughly 7.7% stake in Vale, according to FactSet, supported the appointment of Manuel Oliveira as chairman and proposed electing Jose Mauricio Coelho to the board, Vale said.

Oliviera's "leadership would positively contribute to the strengthening of governance practices, the improvement of strategic management and the alignment with the interests of shareholders and stakeholders," Previ argued, according to Vale.

Vale said it is assessing necessary measures for calling the extraordinary general meeting.