The 32-year-old has spent the first ten seasons of his career in Colorado, where he's ultimately had moderate success. In just over 1300 total innings pitched, he's posted a 106 ERA+ and compiled 13.7 rWAR.
He's coming off a three-year $29.5MM contract extension that he finalized back in 2007, as the Rockies declined an $11MM option for 2012. Earlier we'd heard that the Pittsburgh Pirates were interested in Cook.
Twitter / @Ken_Rosenthal: Sources: RHP Aaron Cook in ...
"Sources: RHP Aaron Cook in agreement with #RedSox on minor-league deal. Pending physical. Will compete for spot in rotation in spring. #MLB"