The 36-year-old, who captains Poland’s national football team and plays for Spanish club Barcelona, picked up the injury during Barcelona's 0-1 loss to Real Sociedad in the Spanish La Liga on Sunday, Polish state news agency PAP reported.
Poland will play Portugal away on Friday before taking on Scotland at home three days later.
After four rounds of fixtures, Poland are third in their Nations League Group A1, six points behind Portugal and three points back of second-place Croatia.
The Nations League is the European football governing body UEFA’s newest national-team competition that is now in its fourth edition.
Portugal won the first edition of the Nations League in 2019, while France won the 2020/2021 UEFA Nations League, and Spain triumphed in the 2022/2023 edition.
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Source: PAP