A tall, commanding central defender with a calming presence on the ball, Krystian has added great maturity to his game since arriving from Legia Warsaw in 2015. The Poland youth international joined as a defensive midfielder, but has since shown his quality at the heart of defence.
He was loaned to Birmingham City in 2016/17, and Walsall in the second half of last season. He is spending this year at Charlton Athletic in League One.
Krystian has already represented the Gunners first team, making his debut in 2015, and made his second appearance a year later.