Porto have announced Jakub Kiwior has joined the club on a permanent deal from Arsenal.
The defender initially joined the Portuguese club on a loan deal last summer, but has now joined permanently for a reported €17m (£14.6m).
Kiwior has featured in 25 games of Porto's league-winning campaign this term and has made a strong impression under Francesco Farioli.
The Poland international has won the second-most aerial duels (46), second-most tackles (33) and registered the second-most interceptions (35) for Porto in the league this season.
He also helped Porto reach the quarter-finals of the Europa League, before they were knocked out by Nottingham Forest.
Até 2030
— FC Porto (@FCPorto) May 5, 2026
FC Porto exerceu a opção de compra de Jakub Kiwior
https://t.co/pJyfJeF7se pic.twitter.com/3pxBbYc74s
Kiwior joined Arsenal halfway through the 2022-23 season, when the Gunners first challenged for the Premier League title under Mikel Arteta, from Spezia.
He reportedly has a €70m release clause in his new contract with Porto, while he has signed a four-year deal.