The two-time Cy Young Award winner is still expected to miss between six to eight weeks because of a strained latissimus dorsi muscle on the right side of his back. Halladay will be shut down for three weeks before he begins a throwing program. He went on the disabled list May 29.
"The important thing is just knowing that a week could save me a month," Halladay said Wednesday. "As much as I want to be back, I want to make sure that when I am back, it's not something I have to address later on, that it's a hurdle that's been passed and doesn't need to be something that reoccurs down the road. I understand that and I'm going to be very cautious of that."
Halladay was first evaluated by Phillies team physician Michael Ciccotti. He also sought a second opinion from Dr. David Altchek, the New York Mets' team physician who specializes in shoulder injuries.
"It's a matter of calming it down and strengthening everything around it," Halladay said. "From my understanding, I was never asked to see him at a later point. Once we calmed it down and got things comfortable, it wouldn't be something we'd have to evaluate later."
Halladay is 4-5 with a 3.98 ERA in 11 starts. He has pitched at least 220 innings in each of the past six seasons, and four times led the league in innings. He was tied for the NL lead with 72 1/3 innings this year before he went on the DL.
There were reports in spring training that Halladay's velocity was down, but the 35-year-old eight-time All-Star downplayed it.
"I think at times it was pretty similar. At times there was probably a few miles per hour difference," Halladay said. "I'm aware that the older you get you're going to have to be a little better at spotting the ball and changing speeds. I think that's part of the aging process. I felt at times it was good. I felt at other times it wasn't as good. I've felt like it's still there.
"I can tell when it doesn't feel like it's coming out the right way. There were plenty of times this year when it felt like it was. There were also other times I felt like everything I had it just wasn't coming out the way it should. I feel like it's there. It's such a matter of timing and all that."
Howard, who is recovering from a ruptured Achilles tendon, did not run bases or play the field, according to the report. Utley is working his way back from an injured knee.
Information from The Associated Press was used in this report.