The central bank bought treasuries from three lenders and will sell them back March 26.
Last week, the central bank injected RON6.72 billion into the market in a similar operation.
Central bank governor Mugur Isarescu said the bank has been adding liquidity to the market on a regular basis because some of the local lenders have difficulties borrowing from their peers. The central bank has been injecting cash into the market every week since October.
Market participants believe the money is used by some of the local banks to fund the Finance Ministry at lower yields.
On the money market Monday, weekly rates were at 2.4%-2.8% a year, slightly up from 2%-2.5% a year Friday. (EUR1=RON4.3783)