Surgery is not an option, general manager Ruben Amaro Jr. said.
"It wasn't something that was even discussed with Ciccotti or Altcheck," Amaro said. "Everybody was kind of on board. I think the strain was mild enough such that it does not require any type of surgery. They injected him. They'll see how it heals and we'll start him on a throwing program whenever it's time to start."
The Phillies, of course, would be wise to pursue every possible nonsurgical route. A significant elbow surgery could prevent Lee from pitching in 2015 - or ever again. The 35-year-old lefthander has said this is his final contract.
This is Lee's first arm injury. He turns 36 on Aug. 30. He will take his prescribed rest at home in Arkansas.
"That looks promising," Phillies manager Ryne Sandberg said. "It's a better sign, not having the surgery."
The flexor pronator muscle is one typically associated with Tommy John surgery. San Diego pitcher Josh Johnson was found to have a flexor strain in spring training. He opted for Tommy John surgery in late April. That is just one of countless examples.
But it does not always lead to surgery. Roy Halladay divulged last September that he had a flexor pronator injury in the mid-2000s. He was told he would eventually need surgery, but that never happened. (Halladay's surgery in 2013 was on his shoulder, not his elbow.)
Phillies reliever Justin De Fratus missed half of 2012 with a flexor pronator strain but never underwent surgery.
Halladay and Charlie Manuel will be honored during alumni ceremonies this weekend. Halladay will throw out the first pitch Friday. Manuel will be inducted Saturday onto the team's Wall of Fame. . . . Domonic Brown did not start for the eighth straight game. He appeared off the bench the previous two days, but Grady Sizemore played left field again Thursday. Brown pinch-hit in the eighth inning and struck out.