Tuesday, he'll be a member of the Yankees, doing his best to end Boston's one-year reign as champions of baseball.
Bellhorn will sign with the Yankees on Tuesday, giving New York another veteran infielder for the stretch run.
When reached on his cell phone on Monday evening, Bellhorn confirmed the move to MLB.com. A Yankees official also confirmed the move on the condition of anonymity.
Several published reports had indicated that Bellhorn would sign with the Oakland A's, but he decided in the end to remain in the American League East, as he knows some players and coaches on the Yankees.
"The Yankees seemed interested," said Bellhorn, speaking from the airport in Phoenix, on his way to Seattle, where he will sign a contract on Tuesday. "The Yankees are one of the most well-known franchises in all of sports. Not everybody gets to play for them."