Freshly crowned Portuguese top-flight champions Porto have announced the acquisition of Jakub Kiwior from Arsenal. The Poland international has spent the current campaign on loan at the Estádio do Dragão, immediately establishing himself as a regular starter in the best defense across Europe’s top seven leagues. Kiwior and co. have conceded just 15 goals in 32 league games. With that body of work to fall back upon, Porto had no hesitation triggering the $20 million (£14.7 million, €17 million) option to buy in his contract. Arsenal could stand to make an extra $5.9 million “depending on the achievement of certain objectives,” while any further transfer for Kiwior will earn the Gunners a maximum of $2.4 million extra, as explained by a statement from Porto . Jakub Kiwior has enjoyed a trophy-winning debut season in Portugal. | Diogo Cardoso/Getty Images Kiwior was never a first-choice option during his two seasons in Arsenal’s squad after arriving from Spezia for a fee in the region of $22.9 million.…