"Aaron Cook, who had been scheduled to start Tuesday against the Pirates, instead will start Saturday at Florida, manager Jim Tracy announced. Josh Fogg and Jhoulys Chacin would be candidates to replace Cook, who has a sprained right big toe, in the opener of the series against Pittsburgh.

Cook had been dealing with toe soreness and aggravated the injury in his last start Wednesday at Philadelphia when he went to back up third base and had to reach for an errant throw.

"We're making very, very good strides with it," manager Jim Tracy said. "But we really feel, similar to the Marquis blister that if we push this and run him right back out there on Tuesday, we're running the risk of having this be a toothache that won't go away."

Pitcher Jason Marquis dealt with a blister on the middle finger of his pitching hand since mid-June. After making his first scheduled start following the All-Star break on July 19, the Rockies pushed Marquis' next start back three days, and he took the mound July 28 at New York. Tracy and Marquis said in recent days the blister is no longer an issue."