Goldman Sachs and its investment banking partner in China may part ways, potentially raising questions about future control of the Wall Street firm's business there, the Wall Street Journal reported on Monday.

Fang Fenglei, chairman of a joint venture called Goldman Sachs Gao Hua Securities, has said he plans to start a private-equity fund that could raise as much as $2 billion, the Wall Street Journal said, citing "people familiar with the situation."