Hill was the starting pitcher in Thursday night's epic NLDS clincher in Washington, lasting only 2 2/3 innings. He was removed with runners on the corners after allowing only one run. He was relieved by Joe Blanton, who quashed the threat.
Pitching on short rest Thursday, Hill struck out six and didn't allow any extra-base hits.
• NLCS Game 2: Tonight at 5 PT on FS1
Hill also started and lost Game 2 against Washington, allowing four runs in 4 1/3 innings, and striking out seven in the first three innings.
Hill's only postseason appearance prior to this year was with the Cubs in 2007.
Roberts said he was not ready to announce a Game 4 starter. Rookie Julio Urias is a likely candidate.
Ken Gurnick has covered the Dodgers for MLB.com since 2001. This story was not subject to the approval of Major League Baseball or its clubs.