The article examines monetary issues related to Poland's potential entry into the Economic and Monetary Union (EMU). It analyzes the fulfillment of Maastricht criteria by existing EMU members in 1997 and discusses the European Central Bank's stance on expanding the union. The article also explores Poland's early EMU strategy and compares it with Slovenia's approach. It assesses the convergence of monetary and economic variables and the ability to meet the Maastricht criteria sustainably.