Tanaka, who has battled elbow injuries over the last two years, is dealing with inflammation in his pitching shoulder, according to the Yankees. In a corresponding move, New York recalled right-hander Giovanny Gallegos from Triple-A Scranton/Wilkes-Barre.
The Yankees announced the roster moves before their game against the Boston Red Sox on Saturday afternoon, one day after placing left-hander CC Sabathia on the DL with a knee injury. New York also is without Michael Pineda, who will miss the rest of the season after undergoing Tommy John surgery on his elbow.
Tanaka last pitched Wednesday in a shaky performance against the Toronto Blue Jays. He walked a season-high five batters in four innings, but the Yankees won 11-5.
He was scheduled to pitch against the crosstown New York Mets on Monday. The Yankees have not named a replacement for Tanaka in the rotation.
Tanaka, 28, is 8-10 with a career-worst 4.92 ERA in 23 starts this season.