Marshall didn't make his season debut until Sunday against the Nationals, but he threw a 1-2-3 seventh inning with one strikeout. A scout noticed that his velocity seemed to be down, however. Before Sunday, Marshall hadn't pitched in a big league game since March 22 during Spring Training.
Because Marshall pitched Sunday, the Reds wouldn't be able to back date a disabled-list stint very long.
"We waited as long as we could with an 11-man pitching staff," Baker said.
Mark Sheldon is a reporter for MLB.com. Read his blog, Mark My Word, and follow him on Twitter @m_sheldon. This story was not subject to the approval of Major League Baseball or its clubs.