The deal, if confirmed, will make the 26-year-old, who is currently at Euro 2016, the most expensive Polish player. Spanish newspaper Estadio Deportivo said the main terms of the contract have been agreed.
The defender is familiar with France's Ligue 1, having played for Bordeaux, Reims and Nantes before joining Sevilla in 2014. He made 26 appearances for the Spanish club in the 2015-16 season.
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(Reporting by Agnieszka Slupska and Silvia Recchimuzzi in Gdynia)
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