The nine-day camp in Warsaw began on Sunday and runs until June 10. The next day, the Polish team will head to its Euro 2024 base in Germany.
The Polish Football Association (PZPN) in April announced that Hanover in northern Germany would be the official training base for the national squad during Euro 2024.
The Poles will face France, the Netherlands and Austria in the group stage of the tournament, following a draw in Germany in December.
The Polish team will open its Euro group-stage campaign with a fixture against the Netherlands in Hamburg on June 16.
The Poles will next take on Austria in Berlin five days later and then play France in Dortmund on June 21.
Ahead of the European tournament, Poland will play two friendlies at the National Stadium in Warsaw, taking on Ukraine on June 7 and Turkey three days later.
Manager Michał Probierz last week released an initial list of 29 players called up for the championships.
Probierz told a news conference on Sunday that his team is aiming to advance to the knockout stages of Euro 2024 and "will do everything to make that happen."
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Source: IAR, PAP