11:33am: Hayes tweets that the two sides have had the deal in place since Thursday night, which is what prompted the flight to Boston.

11:23am: Sean McAdam of CSNNE.com reports (via Twitter) that Gonzalez has already taken his physical and his surgically repaired shoulder "should be fine." Some minor tests still need to be completed.

11:13am: MLB.com's Peter Gammons tweets that the player to be named later is not a "prime guy." The two teams determine who exactly it will be later.

10:52am: Morosi tweets that Gonzalez is seeking a Ryan Howard-like contract. Howard signed a five-year contract extension worth $125MM earlier this year.

10:13am: Ken Rosenthal of FOX Sports tweets that the Padres will also receive a player to be named, so it's a 4-for-1 swap. The 40-man roster freeze is in effect until next week's Rule 5 Draft, so it's possible the player is a minor leaguer not on the 40-man that's eligible for the Rule 5.

10:04am: Heyman tweets that there is still work to be done as far as a contract extension for Gonzalez, and that it could take a day or two. Jon Paul Morosi of FOX Sports confirms with a source that the trade is "not completely done." (Twitter link)

9:14am: Hayes tweets that the package includes Kelly, Rizzo, and Reymond Fuentes. ESPN Boston's Gordon Edes says (via Twitter) that Theo Epstein flew from San Diego to Boston with Gonzalez, and MLB.com's Corey Brock says that Jed Hoyer implored his scouts to scour the lower level of the minors in 2010 (Twitter link). The second and third player in the deal are key.

9:01am: SI.com's Jon Heyman tweets that negotiations about a contract extension will begin shortly, and that Kelly is in fact in the deal. WEEI.com's Alex Speier adds that multiple Red Sox prospects rumored to be in the deal have yet to hear anything from the team about a trade (Twitter link).

7:39am: Olney tweets that the Red Sox flew Gonzalez into Boston to help move the process along, and he is there now.

6:30am: Adrian Gonzalez is expected in Boston today for a physical, reports Nick Cafardo of the Globe. Gonzalez had shoulder surgery to clean up his right labrum in October and has a four or five month recovery timeline. Cafardo says talks have centered around Casey Kelly and Anthony Rizzo, and the deal "would likely involve three or four players from the Sox, including one who is major league-ready." ESPN's Buster Olney says that all players have been agreed to and the Red Sox are now trying to work out an extension with Gonzalez. MLB has approved a negotiating window.

SATURDAY, 12:01am: The Red Sox are very close to acquiring Adrian Gonzalez from the Padres, tweets Dan Hayes of the North County Times. Hayes says the trade would just involve Gonzalez and not Heath Bell, whose name has come up in other rumors. Hayes adds that the deal will only involve minor leaguers – not players such as Jacoby Ellsbury, Daniel Bard, or Jed Lowrie. Top Red Sox prospect Casey Kelly would definitely be involved.

FRIDAY, 4:46pm: The Red Sox and Padres are discussing a potential trade that would send Adrian Gonzalez to Boston, according to Gordon Edes of ESPNBoston.com. Red Sox GM Theo Epstein appears to be making "some headway" in tempting Padres GM Jed Hoyer with a package of top prospects, Edes reports.

The proposed deal would include minor league players only. Hoyer, new assistant Josh Byrnes and Padres exec Jason McLeod are all former Red Sox executives, so they know the team's system well. Other clubs also have strong interest in the first baseman.

The Padres must address multiple needs on a limited budget this offseason and trading Gonzalez and his $6.2MM salary would give the team some flexibility. However, few hitters have Gonzalez's power and they would create a hole by dealing their first baseman.

The Red Sox, who have long had interest in Gonzalez, could move Kevin Youkilis to third base to make room. A trade for Gonzalez would effectively end Adrian Beltre's tenure in Boston.