Prime Minister Mateusz Morawiecki confirmed that information had been received from the CJEU.
A copy of the court's decision was posted on Twitter by NGOs. Polish media also carried the news.
The PM was asked about the media reports in Brussels.
"Information has come from the side of the CJEU," he stated. "Certainly after analysis we will address it. In talks in Brussels I think I have persuaded several leaders of how the Polish judicial reforms looked and how needed they were."
Asked on Friday in Brussels whether Poland would respect the CJEU decision, Morawiecki replied: "We'll see what propositions there are from the EU institutions. Various possibilities will be analysed once we know them."
According to media, the CJEU decided to suspend the rules governing retirement for Supreme Court judges who are over 65 and return those who have already gone into retirement to their posts - under the conditions prevailing before the new Supreme Court law came into effect.
The ruling Law and Justice (PiS) party's spokeswoman, Beata Mazurek, was guarded in her response to the news.
"Poland is an EU member and will conduct itself in line with the binding EU laws," she commented. "But at the moment, it is just media news and until we have become familiar with and studied the document it will not be possible to talk about details."