"Todd Helton is a first baseman in waiting.

His back and legs feel better, but manager Jim Tracy isn't inclined to activate Helton until Saturday given the run of power pitchers the Rockies will face over the next three days (Ricky Nolasco, Josh Johnson and Philadelphia's Roy Halladay).

"You have to bear that in mind," Tracy said. "He hasn't seen pitching for a few weeks, and there's an easier way to introduce him to that at the major-league level than against these very special pitchers."

Helton has started just three times since June 27. He knew he wasn't coming off the DL Tuesday but seemed surprised that a move might not occur until Saturday.

"I have no idea what they are doing," he said during batting practice.

Helton can only receive one more epidural injection for his back this season, so the Rockies are being cautious with his health. Tracy believes Helton can contribute down the stretch if his back is right."