Stanton took to Twitter on Friday, saying "I'm much better today & deeply appreciate your prayers!"
A frontrunner for the NL MVP award, Stanton's season likely ended Thursday night when Milwaukee's Mike Fiers lost control of a pitch. Blood poured from Stanton's mouth before he was taken to a hospital.
The Marlins say Stanton was expected back in Miami on Friday. The team has not definitively said his season is over, though manager Mike Redmond strongly suggested he does not expect Stanton back in 2014.
Stanton leads the NL with 37 home runs and 105 RBIs.