The 26-year-old left-hander spent parts of the past two seasons with the Tampa Bay Rays, going 1-0 with a 6.30 ERA in 24 appearances. He was traded to Seattle in November and dealt to Baltimore in December before being designated for assignment on Feb. 4.
To make room for Riefenhauser on the 40-man roster, the Cubs designated left-hander Edgar Olmos for assignment on Friday.
Copyright 2016 by The Associated Press
This story is from ESPN.com's automated news wire. Wire index
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