Unfortunately, that's what happened Tuesday after the star running back suffered a calf injury during organized team activities.
The Houston Chronicle reported that Foster had ice on the calf as he was carted off the field. It's unclear at this time how much time Foster will miss with the injury, but expect the Texans to use extreme caution at this stage.
Star wide receiver Andre Johnson, who has suffered his share of lower-body injuries over the years, doesn't believe Foster's injury should cause concern.
"I don't think it's anything serious where anybody should be worried or something like that," Johnson told the Texans' official website. "I think if it was, he would've said something. You can tell when it's something serious. I've been around it long enough. So, I'm sure he'll be fine. Just give him a little rest; he'll be back out there."
Foster has been the engine of the Texans' offense for three years running. He led the NFL with 351 carries last season, compiling 1,424 rushing yards and 15 touchdowns.
Follow Dan Hanzus on Twitter @DanHanzus.