Miami Marlins right fielder Giancarlo Stanton was hoping to return within six weeks of having surgery on his fractured left wrist, but slow progress through his recovery has thrust that timetable into doubt.

Stanton, who suffered a left hamate fracture on a swing June 26 and underwent surgery two days later, said his rehab is going slower than expected.

"Definitely slower," Stanton said. "That's the generation of your whole swing is that turnover [with] your hand and your wrist. I know what a sore wrist feels like, and now with a broken hand and the sore wrist, it takes a little longer."

There is no timetable for his return, after the original diagnosis of four to six weeks.

Stanton, who missed the All-Star Game while moving through his rehab, has 27 home runs and 67 RBIs this season, to go with a .265 batting average.

Information from The Associated Press was used in this report.