Poland need to be "calm and confident" if they want to beat Euro 2016 favourites Germany, the country's captain Robert Lewandowski has said.
Poland beat Northern Ireland 1-0 in their tournament opener on Sunday, with Ajax striker Arkadiusz Milik netting the only goal of the game in Nice.
Milik had the majority of his side's chances against a defensive-minded Northern Ireland outfit, who did their best to outnumber Lewandowski throughout.
Up next for Poland is Germany at the Stade de France in Paris, where Lewandowski will be up against Bayern Munich teammate Jerome Boateng, and potentially future colleague Mats Hummels, who could make a return from injury.
"The lads know me really well. Germany has super players and enormous quality in every position," Lewandowski told reporters.
Poland and Germany met in Euro 2016 qualification, with each team claiming three points in their home game.
"We know each other really well," Lewandowski said. "We met in the qualifiers, and for me Germany are the favourites. And I mean the tournament favourites. They can reach the final and win it. We know how strong they are right now."
But while the striker believes it will be tough for Poland to get something from the game, he still feels they have the ability to cause an upset.
"We will fight. Everything is possible in a tournament," he said. "We need to remain calm and be confident, and play without fear and stress. We know just how difficult it will be for us. But it's only football, and we also need to enjoy ourselves. If we achieve that we can do it."