Bernie Ecclestone has admitted Bahrain has only two weeks left to clear the path for a rescheduled Grand Prix in 2011.
After the FIA's original May deadline, the F1 chief executive successfully pushed for a one month extension amid reports the situation inside the troubled island Kingdom is improving.
Ecclestone admitted to Swiss newspaper Blick that June 3 is now the final deadline otherwise there will be no time to have a decision rubber-stamped.
"Yes, because we need a decision of the FIA World Council to change the calendar," he said.
"First, we need the guarantee from Bahrain that it is now safe to have a Grand Prix," added the Briton.
The latest rumour is that, if that guarantee is forthcoming, the inaugural Indian Grand Prix could be moved from late October to early December to make room for Bahrain.