Saudi Arabia is set to hire Citigroup Inc, Goldman Sachs Group Inc and HSBC Holdings Plc for a secondary share sale in Saudi Aramco, a deal that would raise about $20 billion, Bloomberg News reported on Thursday, citing people familiar with the matter.

The state oil company is also in talks with other banks as it pulls together a roster of advisers, the report said, adding that the offer may come in the next few weeks.

Aramco did not immediately respond to a Reuters request for comment.

(Reporting by Harshita Meenaktshi in Bengaluru; Editing by Shailesh Kuber)