The Brazilian, who captains the Spanish side, is facing a lengthy spell out of action after coming off worst in a collision with Aston Villa striker Christian Benteke on Saturday
The Brazilian defender was injured in the 11th minute of the 3-2 pre-season defeat against Aston Villa on Saturday following a collision with Villa striker Christian Benteke.
He was helped off the field before being replaced by debutant Roberto Chen, with hospital tests subsequently showing a fracture.
The news is a huge blow for Malaga's new boss Bernd Schuster, who could now be forced to do without his captain for around two months.
Los Boquerones begin their Liga campaign with a trip to Valencia next Saturday.