Marshall is scheduled to have surgery on Tuesday to clean out his left shoulder.
"What do you think? I think Pricey [manager Bryan Price] might have fun with that one," Marshall said.
Several players took notice of the sign and laughed along with Marshall.
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.