Presiding judge Patrick Robinson said Milosevic was not present in a courtroom due to his condition.
He said a decision on the continuation of the trial would be made this afternoon after the trial chamber analysed reports by ICTY doctors and a Dutch-Belgian team of cardiologists about Milosevic's condition.
Prosecutor Geoffrey Nice called on the trial chamber to consider alternative possibilities for the continuation of the trial and suggested that judges order Milosevic's court appointed defence attorney Steven May to meet with the witness scheduled to give his testimony on Monday so as to prepare to take over the defence.
Milosevic is charged with 66 counts of genocide, crimes against humanity, violations of the laws and customs of war, and grave breaches of the Geneva conventions over his role in the 1990s wars in Croatia, Bosnia-Herzegovina and Kosovo, which claimed the lives of more than 200,000 people.