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.

Rookie Will Warren (2-2, 4.75) has battled inconsistency thus far, and the Yankees parted ways with Carlos Carrasco (2-2, 5.91) last week. Fried and Carlos Rodón (3.29 ERA and an American League-high 67 strikeouts in 54.2 innings) can’t carry the rotation on their own, especially if Gil and Stroman remain out through the summer.