Stanton was scratched from Monday's lineup due to pain in his left knee. The team was off on Tuesday, and the 22-year-old right fielder was examined by Phillies physician, Dr. Michael Ciccotti, in Philadelphia.
"Basically, it's the same type of stuff from Spring Training," Stanton said. "There is no specific injury to it. It's something that I'm going to have to deal with. There are times I'm going to have to deal with that, and some stretches that I won't."
Stanton missed a majority of Spring Training with left knee inflammation. With the early travel and chilly temperatures in Philadelphia, the knee has been acting up.
With two days of rest, the slugger was deemed good to go in the second game of a three-game series with the Phillies at Citizens Bank Park.
The good news, Stanton says, is all the ligaments in the knee are intact. But the concern is that exams haven't pinpointed exactly what is wrong with the knee.
Asked about his level of concern, Stanton said: "It's pretty moderate. It's something that's obviously not going to get much better by playing every day. It's something that you have to kind of deal with, gauge the pain and deal with what you've got."
The Marlins plan to monitor Stanton and likely will give him periodic time off.
"I'll go out, and run around a little bit and see the feedback," Stanton said before batting practice.