Manager Kirk Gibson said Monday that Kennedy had "gotten away from who he is."
Kennedy is hopeful that Tuesday's throwing session will start the process of getting him back.
"There's no quick fix to anything," Kennedy said. "It's just about getting back to making sure all the little points are good throughout the bullpen and not getting lazy about it."
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.