The leu opened at 4.242/4.245 against the euro, close to 4.24/4.243 at closing Friday.
Later, the leu continued to weaken and, at around 10:10 local time, it was trading at 4.260/4.262 against the European coin.
The central bank set Friday a leu-to-euro reference of 4.2233 units, stronger than the previous reference of 4.2454.
On the money market, overnight rates rose to 4%-5% a year, as banks are once again starting to make their minimum required reserves.