Tejeda failed to retire any of the four Twins he faced in the 10th inning Tuesday and took the loss. He has yielded 10 hits in 5 2/3 innings, with opponents hitting .417 off him in seven relief appearances.
Tejeda's fastball velocity, which was in the mid-90s last year, has dropped to the upper 80s and low 90s.
"I'll back him off some until he gets his velocity back," Royals' manager Ned Yost said.
Tejeda altered his offseason throwing program after going on the disabled list last July 30 because of a strained right biceps tendon and was not activated until Aug. 29. He also missed a month in 2009 with right rotator tendinitis.
Yost said he has no doubts Tejeda's velocity, which has dropped six miles per hour, will return.
Tejeda was 3-5 with a 3.54 ERA in 54 relief appearances last season. He had a 12.96 ERA in his first 10 outings, but a 2.05 ERA in his final 44 appearances.
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