Nissan warned on Wednesday that first-quarter profit tumbled around 90 per cent, a day before it is expected to announce more than 10,000 job cuts as the crisis deepens at Japan's second-largest car maker. The dismal earnings, due to be formally announced on Thursday, mark one of Nissan's worst quarterly performances in about a decade. The car maker is fighting to rein in its operations after years of aggressive expansion under former chairman Carlos Ghosn, ousted last year in a dramatic scandal that shook the industry. Nissan's planned job cuts over the next few years include the 4,800 detailed in May and will mostly be at factories overseas with low utilisation rates, a source said on Wednesday. The company declined to comment on the cuts. It said a <em>Nikkei</em> business daily report that it suffered a roughly 90 per cent year-on-year drop in first-quarter operating profit was "broadly accurate". Nissan is struggling to improve weak profit margins in the US, a key market where Mr Ghosn for years pushed to aggressively grow market share during his time as chief executive. Years of heavy discounting to grow sales in the world's second-biggest car market have left Nissan with falling demand for the Altima saloon and other models, a cheapened brand image, low resale values and a nearly battered bottom line. "Deteriorating performance in the United States is a big issue that we're facing," Motoo Nagai, chairman of the car maker's newly formed audit committee, said on Wednesday. "For a long time we were concerned with increasing volume [sold in the market]. We were chasing numbers. Now it's time to enhance the brand," he said. The job cuts to be disclosed this week would exceed 7 per cent of Nissan's 138,000-strong workforce and are part of a broad "turnaround" strategy to be rolled out later this year, said another source, a top executive who asked not to be named because he is not authorised to speak with the media. The plan would be "aimed at unwinding Ghosn’s negative legacies", which has led to excess, he added. Regions with significantly under-utilised manufacturing capacity which could be affected by job cuts included India and Brazil, another source said. The latest job cuts highlight the extent of problems facing chief executive Hiroto Saikawa, who is also grappling with fractured relations with French alliance partner Renault following the arrest of Mr Ghosn, their shared former chairman. Mr Ghosn has been charged with financial misconduct in Japan and denies wrongdoing. Mr Saikawa kept his job in a vote at an annual shareholders meeting last month, fighting off a rare rebuke by top proxy advisory firms who urged shareholders not to reappoint him considering he had been groomed for leadership by Mr Ghosn. But an extended tenure for Mr Saikawa at Nissan may be unlikely, as the car maker has told a newly formed nominations committee to find his successor. "We want to start the process to find a successor to the CEO as soon as possible," said Masakazu Toyoda, the car maker's lead external director who also chairs the new committee which will meet for the first time later on Wednesday.