The Boston Red Sox placed first baseman Triston Casas on the 10-day injured list Sunday with a left rib strain.
The Red Sox recalled catcher Tyler Heineman from Triple-A Worcester in a corresponding move.
Casas, 24, felt discomfort in his rib area during his first at-bat in Boston's 4-2 victory over the Pittsburgh Pirates on Saturday and left the game.
He has six home runs and 10 RBIs in 22 games this season.
Third baseman Bobby Dalbec replaced Casas at first base in the bottom of the first inning Saturday, and Pablo Reyes took over for Dalbec at third for the short-handed Red Sox.
Boston is already managing several injuries to every-day players. Third baseman Rafael Devers (knee) and outfielder Tyler O'Neill (concussion) did not play in the win but could return Tuesday against the Cleveland Guardians, manager Alex Cora said before Saturday's game.
The Associated Press contributed to this report.