Rockies shortstop Troy Tulowitzki said it was possible he could go to the 15-day disabled list after straining his left groin on Wednesday night. Tulowitzki said how he feels Thursday will determine the next step in dealing with an injury that has lingered since the season-opening series in Houston in April. "It's tough," the shortstop said. "The first thing I thought about was we're playing well and we have a chance for a sweep [Thursday against the Astros]. But sitting there thinking about it, there's nothing you can really do. When you're hurt, you're hurt. "There are some other guys around the league that are dealing with the same sort of things. Only for so long you can keep going out there until you need to get it right. My groin has been bothering me. There have been tweaks here and there and I'd get a day [off], but this is worse than just the kind of tweak I'd normally felt."