The European Central Bank said net foreign currency reserves of the eurosystem fell by €1.4bn to €172.6bn in the week ending February 13.
Banknotes in circulation fell by 0.3 billion to 418.5 billion, the ECB said.
The gold position of the eurosystem fell by €1m to €130.343bn.
The eurosystem includes the ECB and the national central banks of the euro zone.