"There's definitely something lingering," Sizemore said on Saturday. "I'm not at 100 percent. We're still working through it. I'm still not even doing full activity yet."
Sizemore, who injured his knee during a slide into second base on May 10, has been able to play catch and take part in batting practice. If everything goes according to plan, the center fielder should be able to rejoin Cleveland for the May 27-29 road series against Tampa Bay.
"That's the plan," Sizemore said. "Obviously, we're still going on how the knee feels. Right now, we're just going day to day with it. We're working off of that last day as an ending point. That's kind of how the rehab is geared."
The current knee issue is not related to the left knee injury that resulted in season-ending microfracture surgery in June last year. That said, Sizemore said this injury does include similar discomfort to what he experienced early last season.
"It's a similar injury in the same area," Sizemore said. "So there's a lot of similarities."
In 18 games after initially coming off the DL on April 17, Sizemore hit .282 with six home runs, 10 doubles, 11 RBIs and 15 runs scored. The Indians can only hope that their star outfielder can return to that type of form when he is cleared for rejoining the lineup.
Indians manager Manny Acta said he has been encouraged by what he has seen from Sizemore in batting practice.
"He's swinging the bat very well in BP," Acta said. "He's doing most of the activities that were bothering him the last week or so, bending over and putting some weight on that knee, going side to side. We're anticipating him being ready pretty soon."