The balance sheet of the European Central Bank and the Euro zone's national central banks contracted by euro 26.6 billion to euro 2.012 trillion in the week that ended on September 5, the ECB said on Tuesday.
The contraction came as banks took fewer funds in the ECB's main refinancing operations.
Gold reserves were unchanged at euro 334.433 billion. Net foreign exchange reserves in the Eurosystem of central banks increased by euro 0.6 billion to euro 213.9 billion, the ECB said.