"We talked about something a little different today," Brewers manager Ron Roenicke said. "We're just trying to rearrange the bullpen now. If it was going to be Figaro's ball, who do we have as the long guy?
"If [Henderson's injury] is a DL, whoever we bring up will need to fill a certain role."
Thornburg and Hellweg, each already on the Brewers' 40-man roster, have struggled at Nashville this season. Thornburg holds an 0-6 record with a 6.99 ERA in 10 starts. Hellweg has a better ERA at 4.33, but is 2-4 and has 33 walks and 33 strikeouts.
Adam McCalvy is a reporter for MLB.com. Read his blog, Brew Beat, and follow him on Twitter at @AdamMcCalvy. Kevin Massoth is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.