"Any time you get pulled out of a game ... I've been trying to battle through this," he said. "Last start was the same. It's been like this for a month.
"I'm just trying to get outs any way I can. I know these are important games. Another guy has gone down [left-hander Danny Duffy]. It's something I've been trying to manage throughout the month."
Kennedy said the injury is difficult to treat without rest.
"You'd think my velocity would drop, but it hasn't," he said. "But lately, the sharpness and life on my fastball, and sharpness on the secondary pitches [hasn't been there]. And it hurts my command. It just [stinks] dealing with this.