"We will see how it goes," manager Brad Ausmus said. "If everything goes well, he'll probably have another rehab stint."
Ausmus added that Putkonen's second rehab outing would probably not be with West Michigan. Toledo returns home Friday. Putkonen's eventual return will give the Tigers their long reliever back. Detroit's bullpen has the third-worst ERA in the Majors (5.31).
"I felt good," Putkonen said Saturday after a Friday bullpen session. "I spun a few curveballs at the end."
Jason Beck is a reporter for MLB.com. Read Beck's Blog and follow him on Twitter @beckjason. Matt Slovin is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.