"His bullpen did not go well," manager Lloyd McClendon said Sunday. "We decided to send him back and let the doctor do his thing, evaluate, and we should know more on Wednesday."
McClendon said Furbush completed his full bullpen throwing session and didn't have any new issue, but was still dealing with the same type of soreness.
"It just didn't get any better," McClendon said. "He's hit a block in the road, so to speak."
Furbush's absence has been significant for a bullpen that has worn thin in the second half of the season. The 29-year-old posted a 2.