Forced to leave a Sept. 13 game against the Giants, Ethier successfully shagged fly balls Tuesday in San Francisco but tried to test the ankle running bases and quickly encountered problems and ended the session. Ethier was expected back in the Bay Area late Wednesday.
"He went to run bases yesterday and it didn't go very good," Mattingly said. "Just make sure we're not missing anything. I think they said they would rule out there's not something major going on."
While Mattingly said he and general manager Ned Colletti have yet to sit down and hash out the first-round roster in depth, he expects to go with 25 healthy players.
Ethier missed his 10th game with the injury Wednesday. He is batting .272 with 12 home runs and 52 RBIs for the NL West champions. Ethier has had a strong second half and became the first player in Dodgers history to reach 30 doubles in seven consecutive seasons.
"We have to talk about it. It's tough, you want to play healthy," Mattingly said. "You don't really want to play short. We'll see when we get there with the roster part of it. The main thing now is to be able to find out if he's going to be able to go or not. We may get enough information that it's not even a question one way or the other."
The Dodgers lost the season series to the Giants for the second straight year, the first time dropping back-to-back season series since 2002-03.
Nolasco is eager for another chance.
"My confidence is there. I'm not walking guys so hopefully things will turn around as far as catching a couple breaks," Nolasco said. "I'm not knocking any of their guys, you've got some very good hitters in that lineup. I just feel like I'm not catching a couple breaks here and there that could change the game. I still feel good. I feel like I'm making good pitches. Just getting burned on some things here and there."