Chief Minister Manohar Parrikar is likely to contest from Panaji after quitting the Rajya Sabha.
The bypolls will be held on August 23.
The notification for the byelections was issued on July 29.
While August 5 is the last date of filing nominations, August 9 is the last date of withdrawing from the electoral battle, an EC statement said.
The counting will take place on August 28.
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Parrikar had represented the Panaji assembly seat in the Goa assembly till he was appointed Defence Minister in the Modi government.
Siddharth Kuncalienkar (BJP) had recently resigned from the Panaji seat to make way for Parrikar's election as MLA.
The bypoll to Valpoi seat in Goa was necessitated after sitting Congress MLA Vishwajeet Rane had resigned to join the BJP.