But the four hamstring injuries have led to concerns that there could be a common link. Possibilities are the new director of performance enhancement Marty Miller and assistant for performance enhancement Dana Cavalea.
"You get concerned about it, no doubt about it, and try to figure out if there's any connection," Cashman said. "Some are more so explainable than others, but obviously, we have to look into everything. I'm not saying, I can't tell you it's coming from the conditioning program at all, I can't tell you that. But you have to investigate every aspect at the same time, and I have done that. Up until this one, I felt like there were explanations for every one."
Mussina, asked about a possible connection to the new strength and conditioning staff, said: "I think that question's already been raised."
But has it been answered?
"I don't know if it's been answered, and I'm not going to be the one to answer it," Mussina said.