BOSTON -- The Red Sox have shifted their rotation as a result of this past weekend's series with the Yankees.
Left-hander Christopher Johnson will be recalled to the active roster Tuesday to start against the Blue Jays. Doug Fister was originally scheduled to go, but was scratched after 2 2/3 innings of relief in Boston's 4-1, 16-inning loss Saturday.
Thomas Pomeranz will start Wednesday night, then Fister will take the mound in Thursday afternoon's series finale against Toronto, giving ace Chris Sale an extra day of rest.
"Obviously with Doug having to come out of the bullpen the other night, we've pushed him back to Thursday ... which was normally Chris' start, but after a high-leverage [7 2/3] innings of work [Saturday], we're going to build an extra day of rest in for him," Red Sox manager John Farrell said Monday.

Sale will take the ball in Friday's series opener against the Angels in Anaheim, and will be followed by David Price and Rick Porcello.
Farrell said the changes offer a chance to add diversity in style to the rotation.
"When you start to look at the similarities of our starters, and obviously with the three left-handed starters that are there, the two most similar might be [Eduardo Rodriguez] and [Price]. So it's just kind of splitting those guys up .... whereas Chris has a different kind of arm slide, different type of stuff. Although left-handed, they're probably much more different than the other two."
The move gives Sale five days between starts, which Farrell cited as important for his ace at this point. The lefty has the most innings (135 1/3) in the Majors.
"We look to take advantage of the off-day for all of our guys, and the innings start to pile up," Farrell said. "He'll go on his regular fifth day the next time through, but then there is an off-day built in the time after that. In early August, I think we have an oddity of a schedule where there's four off-days in a span of 14 days."