South Korean pitcher Chan Ho Park took part in his first workout with the Yankees on Sunday.
Park agreed last week to a one-year deal worth $1.2 million.
"He's a guy we've noticed the past few years, how he plays up out of the bullpen," Yankees general manager Brian Cashman said.
"I think our bullpen is a strength, to be honest. When Chan Ho Park was still on the [free agent] board this late and the ability to get him at $1.2 million, I thought that there was real value there. He makes us deeper."
Chan Ho Park Officially Joins Yankees