Jakub Kiwior has completed a transfer to Porto after making his loan from Arsenal permanent just hours before his former side's Champions League semi-final win over Atletico Madrid.
The Poland international spent the season in Portugal after making the move across Europe on deadline day of the summer transfer window.
Porto held an obligation to make Kiwior's loan permanent and that was completed on Tuesday, only days after the giants won their 31st league title.
Jakub Kiwior joins Porto in permanent deal
🚨🐉 Jakub Kiwior from Arsenal to FC Porto turns permanent as always expected.
— Fabrizio Romano (@FabrizioRomano) May 5, 2026
€17m fixed fee, €5m add-ons and €2m from future sale — also €70m release clause included. pic.twitter.com/NRtlw5tBrP
There was always an expectation that Kiwior would make his move to Porto permanent, due to them holding the obligation to complete the transfer.
The Polish defender has joined the Portuguese champions for a fixed fee of €17million with €5m in add-ons. Arsenal will also take €2m from any future transfer Kiwior makes away from Porto, but there is a €70m release clause in his new deal.
He first joined the Gunners from Serie A side Spezia in January 2023 and proved to be a useful back-up option during his time in North London, making 68 appearances and scoring three goals.
Kiwior enjoyed two successful runs of form in the Gunners' team, being deployed at left back during a brilliant period of results in the second half of the 2023/24 season before standing in for Gabriel Magalhaes at centre back during the closing stages of last campaign.
During that time, he put in a brilliant performance across two legs against Real Madrid in a 5-1 aggregate victory in the quarter-finals of the Champions League.
Despite these good periods of form and Mikel Arteta's desire to keep him at the club, Kiwior was eager to play regular first team football and completed his loan move to Porto at the end of last summer's transfer window.
He helped his new side make history as he made 25 league appearances and 38 across all competitions as Porto won the Primeira Liga for the 31st time, and for the first time since the 2021/22 season.
Kiwior also performed well on the European stage for the second consecutive season, making eight appearances for the Dragons on their way to the Europa League quarter-finals, only to fall to defeat at the hands of Nottingham Forest.
The Poland international was always a useful asset during his time at Arsenal and his contributions to his now former side's evolution and title challenges will be fondly remembered by Gunners supporters.
