Andrew Miller Abruptly Leaves Game After Having Velocity Issues

Stud Indians reliever Andrew Miller left tonight’s game against the Red Sox, in the middle of the seventh inning, after throwing just seven pitches. No reason has been given yet, but it seems ominous:
Andrew Miller just walked off the mound and down the dugout steps in the middle of an inning. Not good. #Indians
— Jerry Crasnick (@jcrasnick) August 22, 2017
Andrew Miller threw seven pitches, all fastballs. MPH: 90, 90, 88, 90, 91, 91, 92.
— Zack Meisel (@ZackMeisel) August 22, 2017
His average FB this season? 95 mph. Yeah, he's not right
Miller had been on the DL with a knee injury this month.
Hopefully this is not an issue that would sideline him for the remainder of the season.