HELSINKI, Sept 1 (Reuters) SWEDISH AUTOMOBILE, SAAB The two Chinese companies that have agreed to buy a stake in Saab have agreed to guarantee a loan to the company, daily Dagens Nyheter wrote on Thursday, quoting unnamed sources. The paper said the decision by Zhejiang Youngman Lotus Automobile Co. and Pangda Automobile Trade Co Ltd had been motivated by Chinese authorities easing the process for the two to take stakes in Saab. The chance of quick decision by the authorities and therefore of Saab getting new money, has risen, one source said. Late on Wednesday, Saab parent Swedish Automobile reported a first-half operating loss of 201.5 million euros ($290.1 million) and warned it could lose the battle to stay afloat.