Arsenal sold Jakub Kiwior to FC Porto for an upfront fee of €17 million (£14.7 million), with the deal potentially rising to €22 million (£18.9 million) including add-ons. The Polish defender joined the Portuguese side on a permanent basis in summer 2026 after Porto triggered their purchase option following a season-long loan.
The deal breakdown
Porto announced in May 2026 that they had activated the option to buy Kiwior, confirming the financial structure of the transfer. The agreement included:
- Fixed fee: €17 million (£14.7 million)
- Potential add-ons: Up to €5 million in performance-related bonuses
- Sell-on clause: Arsenal retained a fixed €2 million clause for any future sale by Porto
- Loan fee: Arsenal received €2 million for the 2025-26 loan spell
When all components are accounted for, the maximum value to Arsenal reaches €26 million (£22.4 million).
Background and context
Kiwior originally joined Arsenal from Italian club Spezia in January 2023 for a fee reported between £17.3 million and £22 million, depending on the source. The 26-year-old centre-back spent three years at the Emirates Stadium before falling out of favour and moving to Porto on loan in September 2025.
His performances in Portugal convinced Porto to make the move permanent, with the deal officially confirmed by Arsenal on July 1, 2026. The transfer represented Arsenal's first completed sale of the 2026 summer window.
Profit picture
Depending on which initial fee figure you use for the 2023 purchase, Arsenal either made a modest profit or roughly broke even on Kiwior. If the lower £17.3 million figure is accurate, the guaranteed €17 million plus loan fee already puts them close to even before any add-ons. The potential bonuses and future sell-on clause could push the total return above the original outlay.
Porto secured Kiwior on a four-year contract running to 2030, with the defender becoming a key part of their squad after their Liga Portugal title triumph triggered the purchase option.