The Royals put Hudson back on the 15-day DL with right biceps tendonitis after he experienced significant soreness following his start in KC against the Athletics on May 10. He lasted just two innings in that outing, allowing four earned runs on two hits while walking four.
"I'll get a report, get an evaluation in LA with Yocum as soon as possible, and go from there," Hudson said. "I just want to find out what's going on in there and go from there.
"It's frustrating just talking about it, let alone handling it. It's been real frustrating to say the least."
Hudson said the initial soreness he felt following his start didn't subside much when the team got to Chicago.
"The soreness was pretty significant the day after [my start]," he said. "It started getting pretty sore the night we got in. Yesterday, it was even more sore."
Both Hudson and manager Buddy Bell are hoping Hudson can return in a couple weeks, but considering his injury problems this season, neither is overly optimistic.
"I would guess [he'll be out longer] just because he hasn't pitched very much," Bell said. "He's been hurt before. I would anticipate it's more than that, but I don't know."
Brian Bannister has been recalled from Triple-A Omaha to take Hudson's place in the rotation, and will start on Tuesday in Oakland.
Greinke's availability: Starter-turned-reliever Zack Greinke wasn't be available to pitch on Sunday after throwing 35 pitches in three innings in Saturday's 5-4, 10-inning loss to the White Sox.
Bell expects Greinke, who surrendered one walk and no hits, will be ready to go on Monday in Oakland.
Greinke's efficient pitch count through the first two innings allowed him to go back out for a third. That aggressive approach could serve him well when he returns to the starting rotation.
"It's one of the reasons why he's in the bullpen," Bell said. "We want him to get his stuff figured out. We expect him at some point to be back in the rotation, but I don't know when that will be."
Dotel, Shealy updates: Reliever Octavio Dotel (oblique) threw a simulated game before Sunday's game. Bell expects Dotel will head out for a rehab assignment this week.
First baseman Ryan Shealy (hamstring) took batting practice before Saturday's game. He'll fly from Chicago to Triple-A Omaha and should start playing in games this week.
Road warrior: Royals ace Gil Meche has been flawless on the road this season by not allowing a run in 20 innings over three starts.
"He's been good, whether it's home or on the road," Bell said. "He's the guy we go to when we need [a win] most."
Meche will look to keep that scoreless streak alive when he gets a rematch with the Athletics' Dan Haren on Monday at McAfee Coliseum in Oakland.
In the first meeting, Meche allowed one earned run over six innings, while Haren surrendered two runs over six innings. Both pitchers struck out seven, but neither factored in the decision, a 3-2 win for the Royals.
Coming into Sunday's game, Meche's 2.15 ERA ranks third in the AL behind Haren's 1.89. Tim Wakefield leads the American League with a 1.79 ERA.
Up next: It's the aforementioned rematch, as Meche (3-1, 2.15) and Haren (3-2, 1.89) hook up for the second time in five days when the Royals travel to Oakland to start a four-game series on Monday. Game time is 9:05 p.m. CST.
Kerry Walls is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.