Defence Minister Panos Kammenos, leader of the right-wing Independent Greeks party, said on Monday he had no plans to leave the government but added he would not join a national unity government, the Associated Press news agency reported.
"The prime minister of this country was faced with a coup staged by Germany and other countries," Kammenos said after meeting with Prime Minister Alexis Tsipras, adding "this deal introduced many new issues ... we cannot agree with it."
The announcement is a blow to Tsipras' six-month-old government, which is struggling to maintain its majority in parliament, ahead of Tuesday's vote on the reforms needed to unlock the eurozone rescue deal.