"This is the most successful period in the club," said the midfielder, who has also played 70 times for Spain, reports Xinhua.
"I have had a lot of opportunities to leave here, but it's my home and I didn't want to leave. How was I going to leave when I was in my best moment and when I was enjoying myself?" continued Koke.
"We have reached an agreement that is good for both the club and myself to allow me to carry on until almost the day I retire," commented the midfielder.