Fortes was scratched from the lineup for Saturday's Grapefruit League game against the Nationals due to back spasms, Christina De Nicola of MLB.com reports.
The Marlins are calling Fortes day-to-day, so there doesn't seem to be too much concern regarding his injury. He'll take a day off to recover Saturday, which will allow Agustin Ramirez to start behind the dish and bat seventh.