They report that Brown is likely to enter the race early next week. The officials spoke Tuesday on the condition of anonymity because they weren’t authorized to share internal discussions.
A Brown spokesman declined to comment.
The only announced candidate so far is Democratic Congressman Ed Markey. Another Democrat, Congressman Stephen Lynch, is also expected to run. The general election is set for June 25.
First elected in 2010, Brown was defeated by Democratic Sen. Elizabeth Warren last fall, but remains popular and still has a statewide political organization.
Kerry was confirmed on Tuesday to become the nation’s next secretary of state.