Chapman underwent an MRI Wednesday after leaving Tuesday night's game early.
The Yankees placed closer Aroldis Chapman on the 10-day disabled list with left knee tendinitis, the team announced Wednesday.
Chapman left the team's extra-innings win over the Marlins on Tuesday due to knee pain.
The closer underwent an MRI on Wednesday and told reporters that he has dealt with knee issues since May.
"Previously, I've been able to pitch with it, to manage it," Chapman said, per MLB.com. "When I got out there, it was just more than usual. Maybe too much pressure on the knee, I don't know. … The pain was more than usual. The discomfort is constant. When I'm pitching and I use my legs and I put more effort into my legs, my knees, then you feel it more."
Chapman left Tuesday's game after just six pitches in the 12th inning. He walked Isaac Galloway, threw a fastball to the next batter and then signaled to the dugout.
Tommy Kahnle came in for the save, and New York beat Miami 2–1 in twelve innings.
In 50 appearances this season, Chapman is 3-0 with 31 saves and a 2.11 ERA.