Schafer fouled a ball off the toe a few days ago and had a hard time sleeping Tuesday night because of pain. The toe had swollen and became infected, Mills said.
Mills is hoping that Schafer will be ready to play on Friday against the Dodgers in Los Angeles.
"I guess [Tuesday] night, in the middle of the night, it started acting up again and he had to go the doctor this morning, and they took part of the toenail, from what I understand," Mills said. "He went back and went to bed and came back to the ballpark at 2:30 [p.m. CT] and he tried to put on his shoe and do some running and couldn't. We're hoping all will be OK when we go on this trip."
Schafer wrote on his Twitter account early Wednesday: "I don't think I've ever been in this much pain!!!!!!" When asked to comment on his condition at the ballpark prior to Wednesday's game, a groggy Schafer declined and said he was going back to sleep.