Piotr Nowak, a Polish international now playing for Chicago Fire, has refuted suggestions that he has given the USA coach Bruce Arena information on the Polish players.
The United States are also opponents of the Poles in Group D.
"It wasn't like that," Nowak, a former skipper of the national side, said.
"Our Chicago Fire coach Bob Bradley helps the USA side and knows Arena very well.
"We just talked about the chances of both the teams in the World Cup and what they should do to do well.
"I didn't go to Arena to offer to work out the Polish team for him."
Polish FA chairman Listkiewicz responded: "Piotr should remember where he comes from and where he became a good player."
Meanwhile Jacek Krzynowek says he is prepared to play wherever Engel chooses.