Varsho reported tightness in his hamstring while running the bases Monday, Arden Zwelling of Sportsnet.ca reports.
Varsho has been on the injured list since the start of June with a left hamstring strain. The Blue Jays will now ease up on his running progression following his latest setback, which will likely delay the start of his rehab assignment by a few days. A timeline for his return to Toronto will likely become clearer once he begins playing minor-league games.