"The Rockies' opening-day starter might be robbed of another closing kick. Aaron Cook will undergo an MRI on his strained right shoulder Monday, but manager Jim Tracy anticipates Cook will miss three-plus weeks at the minimum. That means with any setback, Cook will run out of time in the regular season.

"I will have more information for you on Monday, but he's going to be out for a while," said Tracy, comparing Cook's injury to that suffered by the Rockies' Franklin Morales, who missed a month this season.

This marks the third consecutive season Cook has been struck by a late-season injury. He lost time in 2007 with a strained oblique and last season with a back problem.

Cook has not been right in his last three outings, going 0-3 with a 12.19 ERA.

Tracy indicated Josh Fogg or Adam Eaton will replace Cook on Wednesday. Matt Herges was promoted to work as a long man in case either is needed before that game.

Giambi headed to Springs.

According to a major-league source, the Rockies will sign Jason Giambi to a minor-league contract as they attempt to address their need for another left-handed bat off the bench. Giambi, who would first go to Triple-A, was released Aug. 8 by Oakland after hitting .193 with 11 home runs."