Blue Jays closer Casey Janssen began a minor-league rehab assignment by throwing a scoreless inning Tuesday at Single-A, but now Gregor Chisholm of MLB.com reports that he's been "temporarily shutdown" with more back soreness.

Published: Apr 17, 2014, 11:46 am Added: Apr 17, 2014, 12:03 pm

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Casey Janssen shut down with more back problems