Adam Niedzielski stressed that no decision had yet been made on introducing mandatory inoculation.
He said that 70 percent of Poles were either willing to have shots or had already been vaccinated.
“And this [figure] has stopped increasing. Unfortunately, I have the impression that we are reaching a certain glass ceiling. It is simply difficult to convince those who are unconvinced, because all the arguments and various initiatives have already been undertaken," he added.
More than 12.8 million Poles have been fully inoculated against COVID, health officials said on Tuesday.
Poland on Tuesday reported 123 new coronavirus infections and 26 more deaths related to COVID-19, bringing the country's total number of cases during the pandemic to 2,879,811 and fatalities to 75,005.