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.

New York Yankees pitcher Marcus Stroman will likely be sidelined longer than the team originally expected when he suffered a left knee injury on April 11. Stroman was initially put on the 15-day injured list,