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06/10/08 7:40 PM ET

Tulowitzki begins rehab assignment

No timetable for the shortstop's return, Hurdle says

DENVER -- Rockies shortstop Troy Tulowitzki is heading to Class A Modesto to begin his rehabilitation from a torn tendon in his left quadriceps, manager Clint Hurdle said before Tuesday's night's game against the Giants.

Tulowitzki, who was injured on April 29 against the Giants, was originally expected to return to the Rockies sometime around the All-Star break. However, he has healed faster than expected and has been working out and fielding ground balls with Colorado.

Unlike sluggers Matt Holliday and Brad Hawpe, who spent three days rehabbing hamstring injuries at Triple-A Colorado Springs before returning to the Rockies, Hurdle said there's no timetable for Tulowitzki's return because of the nature of his injury.

"After that long of an injury being down, I think it's appropriate to get him some at-bats and start him off where we are," Hurdle said. "If all that goes well maybe we can send him to Colorado Springs to get him some at-bats."

Jeff Birnbaum is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.