The person spoke to The Associated Press on Thursday on condition of anonymity because there had been no official announcement. A news conference was expected Saturday at the Yankees' spring training complex in Tampa, Fla.
The 43-year-old right-hander is baseball's saves leader with 608. He missed most of last season after he tore a ligament in his right knee while catching fly balls during batting practice.
Rivera has returned home to Panama for a personal matter, and is expected to rejoin the team Saturday.
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