Halladay, now 4-5 with a 3.98 ERA, took the loss on Sunday, allowing a first-inning grand slam to Yadier Molina. He was lifted after two innings by pitching coach Rich Dubee. Afterward, Halladay told reporters he felt it was the right call.
Proefrock said the fact that the Phillies have an off-day on Thursday, allows the team to buy some time with their rotation.
"There is nothing we need to be doing in the next two to three days until we find out the issue," Proefrock said.
When asked if former Phillie Roy Oswalt, a free agent who recently threw a bullpen session for the Phillies was a consideration, Proefrock responded, "I don't think it's worth speculating until we know the issue with Roy [Halladay]."
Right now it's only speculation, but Monday's winning pitcher Cole Hamels expressed confidence that Halladay will make a swift comeback.
"He works harder than anybody I have ever seen, so he will get back there as fast as he can to help the team," Hamels said. "I don't think it is too serious because I play catch with him every day or so."
With Hamels and Cliff Lee, two certified aces, manager Charlie Manuel was asked if the Phillies can withstand a loss of a player like Halladay better than most teams.
Manuel made one thing clear - that it's extremely difficult if Halladay isn't around, but he won't allow his team to hang its collective head, regardless of who is injured.
"When you miss somebody like Halladay and the guys we have out, your team really misses them, but there is nothing you can do until they get healthy and come back so what are you going to do?" Manuel asked.
Then he answered his own question.
"You have to play," he said. "You got to keep playing and keep going and look for people who can keep you afloat until they come back."
Contact Marc Narducci at 856,779-3225, firstname.lastname@example.org or @sjnard on Twitter.