News. The Warriors’ head coach told CSNBayArea.com’s Monte Poole that he will undergo back surgery on Tuesday in Los Angeles to address a herniated disk. Kerr has been dealing with the issue for a few months. In his first season, Steve Kerr started from the bottom and coached the Summer League to gain experience.ews. The Warriors’ head coach told CSNBayArea.com’s Monte Poole that he will undergo back surgery on Tuesday in Los Angeles to address a herniated disk. Kerr has been dealing with the issue for a few months. In his first season, Steve Kerr started from the bottom and coached the Summer League to gain experience.