Lorenzen sustained the injury during his first appearance of the season Saturday, after a shoulder strain had kept him on the shelf for the entire first half. He'll presumably require a shorter period of time to recover from the hamstring injury, but the Reds have yet to offer a concrete timeline for his return to the big club. The Reds called up R.J. Alaniz from Triple-A Louisville to take Lorenzen's spot on the active roster and in the bullpen.
Reds' Michael Lorenzen: IL move official
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