John Kerry
U.S. Secretary of State John Kerry (L) shakes hands with Polish Foreign Minister Radoslaw Sikorski during a brief meeting at NATO headquarters in Brussels Reuters

Polish Foreign Minister Radek Sikorski has said that Poland's alliance with the United States is not "worth anything" in a secret recording obtained by a Polish news magazine.

In a recording obtained by Wprost magazine, Sikorski is allegedly speaking to Jacek Rostowski, a Polish MP from the ruling Civic Platform who was finance minister until last year.

"You know that the Polish-U.S. alliance isn't worth anything," Sikorski allegedly told Rostowski.

"It is downright harmful, because it creates a false sense of security ... Complete bullshit. We'll get in conflict with the Germans, Russians and we'll think that everything is super, because we gave the Americans a blow job. Losers. Complete losers."

According to the conversation transcript, Sikorski calls Poland's attitude towards the United States "murzynskosc", a racially charged word described as "thinking like a Negro."

"The problem in Poland is that we have very shallow pride and low self-esteem," he adds.

It is unclear who taped the conversation or how the magazine obtained the recording.

The move will be damaging for the politician who has been touted by Polish prime minister Donald Tusk as a replacement for EU foreign policy chief Baroness Catherine Ashton.

Sikorski denied the conversation on Twitter by saying that he had never been to the restaurant at which the alleged recording was captured.

"Wprost is lying about a meeting with Jacek Rostowski at Sowa & Przyjaciele. Never in my life have I been to that restaurant," he tweeted.

Foreign Ministry spokesman Marcin Wojciechowski, when asked about the leaked conversation between Sikorski and Rostowski, declined to comment.

"We do not comment on media speculation ... Possible comments will be published only after the whole magazine is published," he said.