Lukasz Fabianski says Poland are expecting a physical approach from Northern Ireland in their European Championship opener.
The two countries start their Euro 2016 campaign in Nice on Sunday, with Germany and Ukraine completing the Group C line-up.
"I have not really analysed their games a lot," Poland goalkeeper Fabianski said.
"But I guess it will be proper physical football, a lot of set-pieces which will tough to defend.
"We will be expecting a lot of intensity and passion from Northern Ireland. We have been lucky that we played against Scotland and the Republic of Ireland in the qualifiers.
"So we know what to expect from Northern Ireland."
Poland qualified for Euro 2016 by finishing second to Germany in their group.
But they did shock Joachim Low's world champions 2-0 in Warsaw - the first time Poland had beaten Germany in their history.
Robert Lewandowski finished top scorer in qualifying - his 13 goals putting him two clear of Sweden's Zlatan Ibrahimovic - and Fabianski recognises the importance of the Bayern Munich striker.
"He's our captain, our leader and our goal-scoring machine," Fabianski said.
"We really rely on him a lot, but the way we are set up as a team is good because it gives us possibilities to score goals. If he keeps his form then we should not be worried at all."
But Swansea goalkeeper Fabianski says Poland are not a one-man team and possess other players capable of causing opponents problems.
"When I speak to Neil Taylor or Ashley Williams at Swansea they talk about Gareth Bale," Fabianski said.
"I'm not sure if they're joking when they say Wales is about defending and trying to give Bale the ball. Hit the opposition on the break, and that's it.
"But I would say we have more offensive options because Arkadiusz Milik, Kamil Grosicki and Jakub Blaszczykowski are dangerous players who give us goals.
"When we have won recent games the other team is so focused on trying to defend against Lewandowski that other players get the chance to score. It helps that he takes a lot of the attention from our team.
"That's a very positive thing for us, and we will try to use it as much as we can in France."