Adcock was optioned to Omaha on Thursday. That came after he had worked a strong five innings of relief in Wednesday night's 15-inning, 4-3 loss to the Orioles. He gave up the game-deciding home run to Adam Jones in the 15th, but he and right-hander Vin Mazzaro were both shipped out to Omaha because fresh arms were needed in Kansas City.
Teaford and right-hander Louis Coleman replaced them on the roster on Thursday. Coleman has worked out of the bullpen twice since his arrival, and Teaford was being held for use in long relief, but, if not needed in that role, he would start Sunday. That's the rotation spot vacated by left-hander Jonathan Sanchez (biceps tendinitis), who subsequently was joined on the disabled list by another lefty starter, Danny Duffy (elbow surgery).
The Royals are uncertain what caused Teaford's abdominal strain, but he felt it while running on Friday. He becomes the ninth player on the team's disabled list.
Teaford, who believes the injury is not serious, said the pain developed during routine practice on Friday.
"It was just over the course of the day," Teaford said. "There's nothing that really set it off. When I went to run, that's when it really flared up."
Teaford said this is the first time he's been injured.
"I broke my 28-year streak of never missing anything in baseball," he said.
Adcock has been caught repeatedly on the Royals' pitching merry-go-round. He began the season in Omaha's rotation and was recalled to KC on April 28. After appearing in three games, he was optioned to Omaha on May 11, but after joining the team in Fresno, Calif., he was recalled immediately and returned to the KC roster on Monday when Duffy was placed on the disabled list. After pitching in Wednesday night's marathon, he left again but is already on his way back.
When a player is optioned to the Minors, he normally must stay with that team for at least 10 days, but that rule is waived if he's needed to replace an injured Major Leaguer.
Adcock, in four games with the Royals, is 0-1 with a 2.51 ERA. He'll be starting on Sunday after three days of rest; in his five innings against the Orioles, he threw 52 pitches.