Argentine bonds and stocks extended gains on Thursday, with news that international banks may be close to a deal to buy debt from holdout creditors, bolstering investor optimism that Latin America’s No.3 economy would soon cure its default. The creditors are considering an offer from Citigroup, JP Morgan, HSBC and Deutsche Bank of 80 cents on the dollar for their roughly $1.66 billion holdings of Argentine debt, Thomson Reuters IFR revealed on Wednesday.