Blue Jays general manager Ross Atkins said that Pearson suffered a "mild re-aggravation of his right groin" injury while throwing a bullpen session Tuesday, Hazel Mae of Sportsnet reports.
Toronto is labeling Pearson as day-to-day, but the setback effectively eliminates any hope he had of making the Blue Jays' Opening Day roster. With Pearson out of the rotation for the time being, Atkins said that Ross Stripling "has a leg up" over Thomas Hatch and Anthony Kay for the fifth starter's role, according to Gregor Chisholm of the Toronto Star.