Sizemore underwent a procedure to correct a sports hernia after he was placed on the 15-day disabled list with a right knee contusion in July. The original timeframe plotted that Sizemore would suit up by Sept. 1, at the latest.
Indians manager Manny Acta said Tuesday, however, that an August return was never a realistic expectation.
"Not the end of this month, no," Acta said. "We never anticipated him being able to come back by the end of this month."
Sizemore suffered the sports hernia sliding into second base on May 10. During that slide, he also suffered the first contusion of his right knee, landing him on the 15-day disabled list.
He put off surgery to repair the hernia until he reinjured his knee, a contusion that caused Sizemore more pain than the one he suffered two months earlier.
Indians head athletic trainer Lonnie Soloff hinted in July that the timetable may have been overly optimistic.
"We're cautiously optimistic that in four to six weeks he's going to return to full baseball activities," Soloff said the day of Sizemore's surgery.
The schedule of the Minor League season could further complicate Sizemore's return. The regular seasons for Class A Lake County, Double-A Akron and Triple-A Columbus all end on Sept. 5.
If Sizemore isn't ready to begin a Minor League rehab assignment before then, the Indians will have to think up creative ways to get their center fielder ready to face Major League pitching again. Over 60 games amid three stints on the DL, Sizemore is batting .234 with 10 homers and 29 RBIs.
For now, Sizemore is expected to regain familiarity with a baseball and, perhaps, a bat in a few days.
"By the end of the week, he can probably be playing catch and maybe taking some dry swings," Acta said.