"There's a chance that Roberto will be skipped of his start with the day off," manager Ryne Sandberg said before Tuesday's game against the Mets.
Hernandez is a logical choice to join the 'pen in the short term because the Phillies could use another right-handed option, and the veteran has made 39 relief appearances in his career.
"He's no mystery to throwing down in the bullpen, he knows the routine," Sandberg said. "For an inning or two, that could be good the next few days."
Austin Laymance is a reporter for MLB.com. Follow him on Twitter at @jalaymance. This story was not subject to the approval of Major League Baseball or its clubs.