Halladay has been on the disabled list since May 28 with a right lat strain.
The two-time Cy Young Award winner and three-time 20-game winner is 4-5 with a 3.98 ERA in 11 starts this season. He is 3-1 with a 2.15 ERA for his career at Dodger Stadium.
Halladay, 35, made a rehab start on Thursday with the Class A Fort Myers Miracle, pitching three innings and allowing one earned run on three hits.
It was a minimal, one-start rehab assignment, but the Phillies are confident that their Opening Day starter is ready to rejoin the club.
"He felt like he was ready, and that's kind of what he wanted to do," manager Charlie Manuel said. "I trust him. I thought he was a good option, even if he threw left-handed."
Halladay threw 61 pitches, striking out four and walking none. After a full count to the first batter he faced, he didn't go to a three-ball count the rest of his outing.
Halladay, a Denver native, threw 30 pitches in a Coors Field bullpen session on Saturday.