Nate Pearson aggravated his strained right groin during a bullpen session Tuesday, decreasing the right-hander's change of making the Toronto Blue Jays' Opening Day roster.
"We do feel it's very mild in nature but want to re-asses that and then just take it a day at a time," Ross Atkins said.
Pearson strained his groin in his debut spring training outing March 1. He felt fine after a bullpen session Saturday, his first since the injury.
A first-round pick in the 2017 amateur draft, Pearson is Toronto's top pitching prospect.