"It was something in his calf, but I don't think it was bad," Twins manager Ron Gardenhire said. "We'll wait until the morning and see how everything is. We need to make a roster move to activate Diamond, so we're going to wait and see what we have to do."
Hernandez tossed 4 1/3 innings, allowing one run on four hits. But one of those hits was a big one, as he gave up a grand slam to John Buck with nobody out in the second inning after Worley loaded the bases.
Hernandez, who made a spot start against the Orioles on Sunday, is a candidate to be either placed on the 15-day disabled list or optioned to Triple-A Rochester on Saturday, as the Twins have to make room for left-hander Scott Diamond, who is set to come off the 15-day disabled list on Saturday to start against the Mets.
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.