Hudson, who underwent shoulder surgery on June 28, 2007, had a setback about a month ago when he threw in an extended spring training game.
"The last game I threw, my velocity was great," Hudson said. "That's one thing that anybody coming back from shoulder surgery, let alone a second surgery, [fears] is that you might never have your stuff again. It's there, but, for whatever reason, it's just not letting me bounce back."
The next day, his shoulder was bothering him and he was shut down again. He plans to resume throwing Saturday.
Hudson was 7-6 for the Royals in 2006 and missed several other wins when the bullpen blew a lead. He pitched just one game last year before undergoing surgery.
He'll have new company in Surprise for a while. According to manager Trey Hillman, pitchers John Bale (broken hand) and Leo Nunez (strained lat) likely will be left in Surprise to continue their rehabilitation work.
Hudson, Bale and Nunez are the only three Royals currently on the disabled list.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.