Brazil's central bank calls auction to buy dollars

SAO PAULO Nov 9 (Reuters) - Brazil's central bank offered to buy dollars on the spot foreign exchange market on Monday in an ongoing effort to boost international reserves and soak up greenbacks pouring into the economy.

The bank has bought about $21 billion on the spot market since May 8, including about $6.7 billion in October, to soak up dollar liquidity and prevent further appreciation of Brazil's currency, the real.

Brazil's currency BRBY was trading 0.99 percent stronger at 1.702 per U.S. dollar shortly after the central bank's announcement.

(Reporting by Silvio Cascione; Writing by Luciana Lopez)