PHOENIX -- D-backs Double-A manager Brett Butler suffered a mild stroke Friday and will be out indefinitely, with Matt Williams taking his place in the interim.

Butler, who has beaten cancer, is expected to make a full recovery, although the stroke has affected his equilibrium. He's resting comfortable in a hospital in Montgomery, Ala.

"He's had some tough luck," said Williams, a former D-back who is Arizona's special assistant to the general partner. "He was one of the best teammates I've ever had, and I just hope first and foremost that he gets well, and I'm going to try to hold it down for him as well as I can."

Williams, who will start on Monday, has said in the past that he would like to eventually manage. He gets his first opportunity with a Double-A squad that includes star outfielders Justin Upton and Carlos Gonzalez.

"I just hope I can fill in well for [Butler]," Williams said. "I'm going to go down and do what I can to help them win and teach a little bit hopefully. We have some very talented players there, so I'm excited about it."