The Astros, who have been hit hard by injuries this season, saw right-hander Chad Paronto go down with a left hamstring strain in the seventh inning of Tuesday's 7-4 loss to the Phillies. He was helped off the field after throwing a pitch to Ryan Howard.
"It felt like it pulled and just was all knotted up," Paronto said. "There's a giant knot back there now. I told [head athletic trainer] Nate [Lucero] that's really the first leg injury I've ever had in my career. It's one of those things. I don't know if I slipped or what it was."
Paronto's injury came minutes after Phillies reliever Jamie Moyer left the game after straining his left groin on his follow-through.
"I saw the pitch and then I planted my foot and after that ..." Paronto said. "They said Jamie had a problem [with footing], too, so I don't know."
Paronto, who has appeared in four games since being added to the roster on Sept. 16, is looking to pitch again in the final five games of the regular season.
"I hope so," he said. "I don't know what they'll tell me, but I plan on being out there tomorrow. I don't know if that's realistic or not, but that's the way I'm going to approach it. I know it's going to be sore, but with [five] days left, what the heck?"
If Paronto is unavailable, the Astros are left with seven healthy relievers, which is normal during the regular season. But most teams call up extra arms for the bullpen in September.
"We'll mix and match and make it work somehow," Astros interim manager Dave Clark said.
Brian McTaggart is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.