The leu closed at 4.3565/4.3575 per euro, 0.2% stronger from 4.3646/4.3655 per euro at Friday close.
The currency opened at 4.361/4.362 to the euro and further gained ground, hitting the day’s high of 4.351 versus the euro.
Market participants said the leu’s appreciation was largely fueled by foreign currency sales from non-residents.
The central bank set the leu’s reference at 4.3552 against the euro, the strongest rate in six weeks.
Against the US dollar, the leu’s indicative weakened modestly to 3.3382 units, from 3.3353 units in the previous session.
In the money market, overnight rates were at 1%-1.5% a year.