The 21-year-old left-hander is only throwing from flat ground for right now, and it could be a couple of weeks before he returns to the mound for higher velocity pitching.
There's no set timeline for Tiedemann's comeback, as the Blue Jays are taking a cautious approach with their top pitching prospect. He last pitched on April 11 for Triple-A Buffalo, posting a 5.63 ERA over eight innings before being sidelined.