Seattle called up right-hander Jorge Campillo from triple-A Tacoma to take Baek's roster spot. Campillo was available for Monday night's series opener against Oakland.

Baek pitched well in his month with the Mariners, making a strong bid for next year's rotation. Called up from Tacoma on Aug. 22, Baek was 4-1 with a 3.67 ERA in six starts.

He pitched seven shutout innings against Texas on Sept. 8 and threw another 6 2-3 strong innings, allowing two runs and four hits in a 6-3 win over the Rangers last Wednesday. Baek was expected to throw Monday night, instead Cesar Jimenez made his first major league start.

Manager Mike Hargrove didn't believe Baek's injury to be anything serious, and more a result of him pitching 181 1-3 innings between Tacoma and Seattle.

``He had tightness in his shoulder, his triceps and his elbow and I think it's just a matter of a long season,'' Hargrove said. ``I don't think it's anything bad.''

Campillo had ligament replacement surgery on Sept. 23, 2005. He completed a rehabilitation assignment with the Mariners' rookie league team in Arizona in August and pitched at both Class A Inland Empire and Class AA San Antonio. Campillo was 2-0 with a 2.53 ERA in two starts at San Antonio.

Campillo made his first major league start for Seattle on Aug. 2, 2005, at Detroit, but pitched only one inning after tearing a ligament in his elbow. Hargrove said he would be used in relief in the final week.