The Morocco captain initially joined the Turkish giants on loan last summer.
Ziyeck signed for Chelsea in 2020 and went on to make 107 appearances.
During his time at the club, he won the Champions League, UEFA Super Cup and Club World Cup.
The Morocco captain initially joined the Turkish giants on loan last summer.
Ziyeck signed for Chelsea in 2020 and went on to make 107 appearances.
During his time at the club, he won the Champions League, UEFA Super Cup and Club World Cup.