Hazel Mae of Sportsnet shared the news, noting an MRI showed inflammation but "nothing major."
This is not the first time the rookie has had an injury this year. He missed time in spring training with a strained oblique muscle, which ended any opportunity he had to start the season in the big leagues.
After playing 13 minor league games, he was promoted to the majors April 26.
Guerrero has been one of the bright spots in what has been a disappointing season for Toronto. The 20-year-old entered Saturday hitting .275/.345/.465 with an .811 OPS through his first 92 games, adding 14 home runs and 54 RBI.
Though he fell short in the finals, the 6'2", 250-pound slugger captivated the baseball world with his power during the 2019 Home Run Derby, mashing 91 long balls in three rounds:
Toronto (52-74) has long been out of playoff contention, and it faces an elimination number of seven with two weeks remaining in August. The Blue Jays will surely take a cautious approach with Guerrero as they look to protect his long-term health.