ATHENS — As representatives of Greece’s international creditors started arriving on Wednesday in the Greek capital for a new round of tough negotiations, Prime Minister Alexis Tsipras said the country would get relief from its huge debt burden as early as November. He also hit out at dissenters within his party, saying that securing a new bailout deal was a priority.

Amid growing opposition within his leftist Syriza party over the prospect of fresh austerity required under Greece’s third financial rescue in five years, Mr. Tsipras accused dissenters of seeking to manipulate the result of this month’s referendum on bailout terms by claiming it was tantamount to a mandate for a Greek exit from the eurozone. “The Greek people voted no to a bad deal, they did not vote for an exit from the euro,” he said.

“Grexit will be on the table until debt relief comes,” Mr. Tsipras told a Greek radio station. However, he said, Athens had secured a commitment to debt relief from creditors as part of the latest bailout package, worth as much as 86 billion euros, or about $95 billion. “Debt relief will come after the first review of the program in November,” he said.