Chennai, Mar 27 (PTI) With Congress hoping that its estranged allies would return to UPA-fold after the elections, PMK today said it has not given any "assurance" to Congress on supporting it in government-formation.

However, the party appeared to keep its option open saying it would decide on support to a prime ministerial candidate only after the Lok Sabha polls.

"It is their wish. We have not given any assurance to the Congress on this," PMK founder S Ramadoss told reporters here, a day after his party parted ways with Congress-led UPA and switched loyalties to the AIADMK-led Front.