Talks between the two teams regarding Gonzalez have been on-and-off for the past year, going dormant after the trade deadline but emerging again in force on Friday night.
While it's not currently known what compensation the Padres will receive, the prevailing rumors were that no major league players would be involved, and that any deal would be centered around top prospects Casey Kelly (RHP) and Anthony Rizzo (1B).
Gonzalez, 28, hit .298/.393/.511 last year with 31 homers and 101 RBI. Even more impressive were his numbers away from cavernous Petco park, coming in at .315/.402/.578. The powerful lefty will likely fit very well in Fenway.