The 27-year-old defender´s deal was due to expire at the end of the current campaign.
Keller is a regular starter under new coach Willem van Hanegem and had no hesitation in agreeing to the deal.
Copyright (c) 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