Although it did not specify the length of Kiwior's contract, the transfer was reported by British media to be worth more than 20 million pounds.

"It's fantastic that Jakub is joining us. He is a versatile young defender who has shown enormous potential and qualities with Spezia in Serie A, and also at international level with Poland," coach Mikel Arteta said in a statement.

He joined Spezia in August 2021, where he made 43 appearances, and was also part of the Polish national team at the World Cup in Qatar.

"Jakub is a player who will add strength and quality to our defensive unit. We welcome Jakub and his family to Arsenal and look forward to working with him," Arteta added.

Kiwior takes the number 15 shirt and will immediately start training with his new teammates.