Though Azad said it would be 'courtesy call' on the DMK patriarch, the meeting is however expected to set the ball rolling for the two parties striking a poll pact.
Azad's visit to Karunanidhi comes in the wake of the DMK leader inviting Congress and DMDK as part of his efforts to cobble up a strong alliance against the Jayalalithaa led AIADMK.
Recently, TNCC President E V K S Elangovan had said that Azad would hold talks with Karunanidhi on the alliance issue.
Azad, who will be accompanied by his colleague and Congress in charge of Tamil Nadu Mukul Wasnik and Elangovan, had said he was meeting Karunanidhi on a courtesy call.