The 27-year-old only made a limited impact last season after suffering a freak jaw injury but has committed to the club until 2010.
Boss Lawrie Sanchez said: "Since I arrived at the club I´ve been impressed with Zat´s commitment and attitude both on and off the pitch. He has a good understanding of the game which is reflected in his positional play."
© Copyright PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: https://www.givemesport.com/writeforgms