The Colorado Rockies added center fielder Willy Taveras to their postseason roster but chose not to include right-hander Aaron Cook, who threw about 90 pitches in an instructional league game in Tucson on Wednesday. Taveras has been out for almost a month with a calf injury but convinced the coaching staff he could contribute with a strong showing during Wednesday's workout at Chase Field. He took the roster spot of left-hander Mark Redman. The Rockies decided against adding Cook, who is eligible to come off the 60-day disabled list this week. Instead, right-hander Josh Fogg, who has fared better against the Diamondbacks this season, will start Game 3 of the NL Championship Series against Arizona on Sunday night.