The head of the National Bank, Adam Grapinski, told the Polish newspaper that Germany wanted to "somehow return" the former land in Poland.
In his view, Germany's plans are unlikely to be hampered by the risk of its own chaos.
"If earlier it was the incorporation of the German states or the absorption of East Germany, the former Soviet occupation zone, then from the moment this task is completed, it is a return in one form or another to their former lands, now in Poland," RIA reported. News, "Grapinski said.
The head of Poland's national Bank believes Berlin also plans to "conquer" the belt of states between Germany and Russia.
"Britain's exit from the EU opens the way to this scenario," the paper's interlocutor suggested.
Mr Grapinski argues that Germany has developed such an idea of a "balanced Europe of the future".
Earlier, Polish head of government Mateusz Morawiecki said Paris and Berlin run the EU as oligarchs.