It's official: Sox announce Napoli deal

Mike Napoli is officially returning to Boston. The Red Sox announced in a team release that they had agreed to terms with the free agent first baseman, who contributed to a World Series championship in his first year with Boston.

The Sox reached agreement on a two-year, $32 million contract last Friday, when Napoli tweeted the news himself.

In order to clear room to add Napoli to the 40-man roster, Boston designated outfielder Alex Castellanos for assignment.

Red Sox general manager Ben Cherington and Napoli are scheduled to speak with the media Friday afternoon. We'll have it all covered here, so check back again tomorrow.