"He's usable, from what I understand," Amaro said.
That is good news for the Phillies, who only have one other left-hander in the bullpen -- rookie Antonio Bastardo. Eyre went 2-1 with a 1.50 ERA in 42 appearances this season for the Phillies.
Had Eyre been unable to pitch and the Phils had to replace him on the roster before the end of the NLDS, Eyre would have been ineligible to play in the NL Championship Series.
Right-hander Chan Ho Park, who is trying to recover from a strained right hamstring, threw a bullpen session in Clearwater, Fla. Amaro said Park has been doing fine.
"I don't think he's quite 100 percent yet, but he's better," Amaro said.
Game 1 of the NLCS is Thursday in Los Angeles. If the Phillies advance to the NLCS, Amaro said he doesn't know if Park will be ready to pitch by then.
Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.