Hanrahan threw 40 pitches off the mound Friday, Rand said.
While neither the Tigers nor Hanrahan put a timetable on his return from Tommy John surgery when he signed at the beginning of May, his rehab has by all accounts gone slower than expected. Part of the extra time has been spent rebuilding arm strength.
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.