Torrealba, who joined the Blue Jays on a Minor League deal in August, has seen his playing time drastically cut since J.P. Arencibia returned from the disabled list on Sept. 7.
Arencibia's return moved Torrealba out of his timeshare with fellow catcher Jeff Mathis and into the role as a third-string player. But Torrealba was back behind the plate against Boston as manager John Farrell looked for a spark on offense.
"The fact is, he has been very good against right-handed pitching in his career and even this year," Farrell said. "Looking for any way we can increase our offensive output and he's a very capable catcher."
Torrealba, who is a free agent at the end of the season, entered play on Saturday hitting .238 with four homers and 14 RBIs in 58 games this season. He is a career .258 hitter over parts of 12 seasons in the Major Leagues.
Arencibia is expected to be back behind the plate with right-hander Brandon Morrow on the mound for Sunday's series finale against the Red Sox.