Japan's economy contracted much faster than expected in the third quarter as global supply disruptions hit exports and business spending plans and fresh COVID-19 cases soured the consumer mood.

While many analysts expect the world's third-largest economy to rebound in the current quarter as virus curbs ease, worsening global production bottlenecks pose increasing risks to export-reliant Japan.

"The contraction was far bigger than expected due to supply-chain constraints, which hit output and capital spending hard," said Takeshi Minami, chief economist at Norinchukin Research Institute.