Sources told ESPN's Buster Olney on Sunday that Stanton is expected to go on the disabled list.
"It didn't look real good,'' manager Don Mattingly said Saturday. "I saw the replay, and it looked like he pulled something. He felt something in his groin area.''
Stanton singled with two out in the ninth but was an easy out trying to stretch the hit into a double. He stumbled and fell approaching second base.
Stanton had a very productive night for the Marlins until that moment with three hits, including his 25th home run of the season and three RBIs.
Information from The Associated Press was used in this report.