Mladic, who was extradited from Serbia to The Hague on Tuesday after his arrest last week, is charged with 11 counts for genocide, persecutions, extermination, murder, deportation, inhumane acts, terror, unlawful attacks, taking of hostages during the 1992-1995 war in Bosnia and Herzegovina.
According to the decision signed by the tribunal's deputy registrar Ken Roberts on Thursday, Aleksic will represent Mladic "at his initial appearance, and in such other matters as may be necessary until a permanent counsel is assigned."