Marlins righthander A.J. Burnett will be traded to the Red Sox within a week, an MLB official said yesterday. Boston plans to sign Burnett to an extension. Red Sox special assistant Bill Lajoie watched Burnett's outing Thursday in Philadelphia, when he allowed six runs in five innings, including second-inning homers to Pat Burrell, Ryan Howard and Mike Lieberthal. Burnett is 5-6 with a 3.64 ERA in 18 starts this season. "There is no truth at all to any deal we are making with the Marlins," Sox GM Theo Eptein said via an E-mail.