A day after their rivals announced an alliance, the Congress is likely to formalise their partnership for the upcoming Lok Sabha elections with MK Stalin's DMK on Wednesday, sources said. The party may get 9 out of 39 seats in the state, and lone seat in Puducherry. Mr Stalin's party is likely to contest in 20-25 seats. The rest of the seats may go to other alliance partners. AICC General Secy Organisation KC Venugopal and General Secy incharge TN Mukul Wasnik are expected to visit the state on Wednesday to seal the deal with Mr Stalin's party, sources said.