Deputy Prime Minister and Defence Minister Władysław Kosiniak-Kamysz also said the agreement would be finalised this week.
"I will not stop efforts to strengthen Poland’s security and modernise our armed forces," he wrote on social media. "The final agreement on the SAFE programme will be signed as early as Friday."
The Polish government's pointwoman on the programme, Magdalena Sobkowiak-Czarnecka, said over the weekend that the agreement would be signed within days by officials including the Polish defence and finance ministers, along with representatives of the state development bank BGK.
The EU defence and budget commissioners are also expected to sign the document, she said.
Under EU rules, member states can independently place defence procurement orders through the end of May. After that deadline, joint purchases with partner countries will be required—a key consideration for Poland, which plans to place most orders with domestic defence manufacturers.
The funds are intended to support projects outlined in Poland's defence investment plan, including the Eastern Shield programme, anti-drone and air defence systems, artillery and upgrades to military transport infrastructure.
The government has said that 89 percent of the funding will go to Poland's domestic industry and economy.
On March 12, President Karol Nawrocki vetoed a bill that would have facilitated Poland's participation in the SAFE programme through the creation of a special funding mechanism.
In response, on March 13, the government authorised the defence and finance ministers to sign an agreement to channel SAFE funds through an existing mechanism under an "Arming Poland" programme.
The SAFE programme offers up to EUR 150 billion in loans by 2030 to support joint defence procurement by participating countries.