Baas (born in Oostvoorne, 17 March 2003) has been part of Ajax since 2018. The left-footed player made his first-team debut on 28 August 2022 during the Eredivisie match FC Utrecht – Ajax (0-2) and spent last season on loan at NEC. So far, he has featured in 34 official matches for Ajax's first team, scoring once.
Technical Director Alex Kroes: "Youri is making tremendous progress. He impressed during pre-season and proves his worth in the heart of the defence week in, week out. Youri is a true club man, an excellent defender, has great vision, and also possesses a precise passing ability. We expect him to continue developing over the coming years, and that's why we're delighted to have secured his future with the club for a longer period."