Henry Owens, Brian Johnson expected to join Red Sox rotation soon

Everybody knows about Henry Owens’ changeup, a pitch so deceiving that Red Sox veteran catcher Ryan Hanigan swung wildly over it during a simulated game in spring training and immediately proclaimed it a major-league caliber changeup.

But can the left-hander command his low-90s fastball well enough to set up his out-pitch? The Red Sox are interested in finding out.

Manager John Farrell casually announced that Owens, the 19th-ranked prospect in baseball prior to the season, according to MLB.com, and left-hander Brian Johnson will join the big league rotation at some point soon.

“All that is on the horizon,” Farrell said.

Owens was lit up by major league hitters in spring training when they…