Since his last stint in the Majors, Alvarez went 3-2 with a 2.82 ERA in seven starts at Triple-A Toledo. He will be pitching on normal rest after making his last start on Sunday.
The Tigers won't need to make a roster move to accommodate Alvarez because of the 26th-man exemption for the doubleheader.
Jason Beck is a reporter for MLB.com. Read Beck's Blog and follow him on Twitter @beckjason. Bobby Nightengale is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.