Horwitz is out of the lineup for Wednesday's game against the Red Sox.
Horwitz's streak of 11 consecutive starts will come to an end while he heads to the bench for the first time since Sept. 11. He'll cede his spot in the lineup to Tyler Heineman, who will handle catching duties while top backstop Alejandro Kirk gets a day off behind the plate but sticks in the starting nine as the Blue Jays' designated hitter.