Tiedemann (undisclosed) was placed on the 7-day injured list Thursday, Hazel Mae of Sportsnet reports.
There were no details provided about the injury. Tiedemann had gotten off to a shaky start to the minor-league season with Triple-A Buffalo, allowing five earned runs across eight innings while walking seven, and he hasn't pitched since April 11. Any possibility of a big-league debut later this season is on hold until his health situation becomes clearer.