"Some more senior Congress leaders are in contact with me to join the party," BJD MP Pinaki Mishra said but refused to divulge the names.
Odisha PCC vice-president-cum-spokesman Sarat Rout, however, said the party is not worried over those who quit it.
"You will see the entry of many senior leaders into Congress in coming days," Rout told newsmen.
While Singh's resignation has sent shock waves in political circles in the state, the change began to be felt earlier. Kamala Das, a senior woman leader from Balasore district quit Congress barely two days ago.
Prior to her, former minister Ramakrushna Patnaik and his wife ex-MP Kumudini from Ganjam district also quit Congress on the same ground followed by another former MLA Umesh Swain from Jagatsinghpur district.
The Patnaik couple, who had joined Congress after quiting BJD in 2002, alleged that they were ignored by the state Congress leadership. They are yet to join any party.