Toronto opted to make the late change in order to provide the second-year hurler with more rest prior to his first outing of the spring.
"We just looked at the overall number of pitches thrown through the pregame portion of the schedule and built one extra day in," Blue Jays manager John Farrell said late Saturday morning.
Farrell said the decision did not have anything to do with a minor foot injury that Alvarez suffered earlier in camp. Alvarez had been shut down for one day last week after getting hit in the foot during a game of catch with left-hander Luis Perez.
Top prospect Drew Hutchison was scheduled to start on Monday, but as a result of these changes, he will be moved to Wednesday. That puts him in line to come on in relief of right-hander Kyle Drabek.