Aaron Boone told reporters on Sunday that Stroman still felt discomfort in his left knee during a simulated game this week. The rule of thumb for pitchers is that for however long they are down with an injury, it takes them just as long to ramp up to return.

New York Yankees pitcher Marcus Stroman had a setback as he tries to return from a left knee injury that has sidelined him for the last month

Stroman has not pitched since the Yankees’ April 11 game against the San Francisco Giants, when he gave up five runs in a single inning. He was placed on the 15-day injured list shortly after, with manager Boone initially hopeful it would be a brief stint.