"We're hoping Perkins has a good shot, and Joe is pretty much a lock," Twins manager Ron Gardenhire said. "So we'll see. We'll find out tomorrow."
Perkins has been impressive this year with a 1.99 ERA and 44 strikeouts in 31 2/3 innings. The left-hander, who is aiming for his first career All-Star Game appearance, also has 20 saves in 22 chances.
Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. This story was not subject to the approval of Major League Baseball or its clubs.