What happened: Jakub Kiwior's transfer from Arsenal to FC Porto has been made permanent, per Fabrizio Romano. The deal is structured as a €17m fixed fee, €5m in add-ons, and €2m owed to Arsenal from any future sale. A €70m release clause is included in Kiwior's new contract at the Estadio do Dragao.

Why it matters: The move resolves Kiwior's Arsenal future after his loan stint and gives FC Porto, fresh off their 31st Portuguese league title, a long-term central defender. The €70m release clause signals Porto's intent to protect the asset against future Premier League interest. For Arsenal, the sell-on percentage and add-ons preserve upside if Kiwior's value rises in Portugal.

What to watch: Watch for Porto's official announcement and Arsenal's reinvestment of the fee into their summer center-back search. Kiwior's playing role under Porto's manager will determine whether the release clause becomes relevant.