Williams, 6-5 with a 4.46 ERA on the year, made two rehab outings since going on the shelf on June 20. His last outing was on July 6 when he gave up three runs (two earned) in six innings for Triple-A Salt Lake.
C.J. Wilson, who bowed out of pitching in the All-Star Game due to a blister in his left middle finger, will start the weekend series against the Yankees on Friday. Wilson said that the blister isn't serious and it won't affect him for the second half.
After Williams goes Saturday, Jered Weaver -- coming off a scoreless fifth inning at the All-Star Game -- will start the series finale against the Yankees on Sunday. Ervin Santana will pitch on Monday, and either Garrett Richards or Brad Mills will start Tuesday's game.
Dan Haren, placed on the DL last week due to lower back stiffness, threw off a mound on Thursday and "felt great," Scioscia told the LA Times. Haren is scheduled to come off the DL next Thursday and could be ready around that time.
Alden Gonzalez is a reporter for MLB.com. Read his blog, Gonzo and "The Show", and follow him on Twitter @Alden_Gonzalez. This story was not subject to the approval of Major League Baseball or its clubs.