BALTIMORE -- Within two weeks this month, the Orioles had placed their starting center fielder and their closer on the disabled list -- subtracting two crucial components of their lineup in a matter of days.

Manager Dave Trembley announced Wednesday that he has marked the calendar for Sept. 1 as the day the Orioles are hoping to welcome both center fielder Adam Jones and closer George Sherrill back to the active roster. Sherrill, who is working his way back from left shoulder inflammation, has been on the DL retroactive to Aug. 16, while Jones has been out since Aug. 3 with a broken left foot.

"Right now, if everything went well with Sherrill and Jones, we're looking at 9/1 [to] activate those guys," Trembley said. "I would think that Sherrill would probably have to play catch again and then obviously in [St. Petersburg] throw off the mound and then be activated when we go to Boston. Jones we're looking at 9/1."

Sherrill made 25 throws from 60 feet on Tuesday afternoon and reported no pain, although the left-hander did admit that he felt "something" in his shoulder, but denied that it was any type of pain.

Jones has been taking batting practice for five days and did some running in the outfield prior to Tuesday's game with the White Sox. To this point, the rookie center fielder has passed every physical test on his way back to the active roster.

"He ran [Tuesday]," Trembley said. "Did real good. ... He's got a couple other things to do [before we can activate him]."

Trembley said that Jones will likely hit live pitching in a simulated-game format over the next six games either in St. Petersburg when the Orioles face the Rays or in Boston.