The midfielder will leave Athletic this summer after 15 years with the club.
Williams told AS: Iker and I are like brothers, we have been together for ten years. I have always felt a lot of admiration for him, because he came from a neighborhood that is next to mine (Txantrea and Rotxapea, two areas in Pamplona). We have many friends in common from before I arrived at Athletic.
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"I've always wanted to be like him. I have seen him grow and I feel lucky to be by his side all these years. We have grown, laughed and cried together.
"He has taught me a lot in a lot of times when things haven't gone well for me."