The leu opened at 4.330/4.331 against the euro, slightly weaker than 4.3275.4.330 at closing Friday.
Within the first hour, the leu strengthened a bit an, at around 10:00 local time, it was trading at 4.322/4.323 against the euro.
The central bank announced Friday a leu-to-euro reference of 4.3295 against the euro.
On the money market, overnight rates jumped to 5.5%-6% a day, from 2.26%-2.76% a day previously, marking the start of a new period for banks to fill their minimum required reserves.