Amid reports that government is determined to go ahead with the Indo-US nuclear deal, the CPI-M on Thursday warned that the Left parties would review their support to it in such an eventuality.

"They have time till June 25 (the next meeting of the UPA-Left Committee) and they have to make up their mind by then. If they go ahead, we will have to reconsider our support," CPI-M politburo member Sitaram Yechury said.

In that case, Left would have no option but to face the situation and "no amount of talks will help," he said.

With over 60 members in the Lok Sabha, the Left parties provide crucial outside support to the Congress-led UPA government which will face difficulties in a trial of strength if the Left withdraws support.

Another Left leader said the government may have to take into account early polls if it wanted to go ahead with the India-specific safeguards agreement.

In the past few days, several rounds of meetings have been held between top Left and UPA leaders. These include two meetings between CPI-M general secretary Prakash Karat and External Affairs Minister Pranab Mukherjee and one between Yechury and UPA chairperson and Congress president Sonia Gandhi [Images].