According to Jeff Goodman of WEEI.com and FoxSports.com, the Celtics  and Rajon Rondo  have agreed in principle to a five-year contract extension that could reach a worth of $55 million. The agreement was first reported by Yahoo! Sports.  Rondo’s agent, Bill Duffy, who works out of California, was scheduled to talk again with the Celtics late Monday morning.
According the Yahoo! report, the parameters of the agreement were reached late Sunday night when Celtics general manager Danny Ainge agreed to the particulars in a late-night phone call, a day before the deadline to ink such an agreement. If there was no extension agreed upon prior to 6 p.m. Monday, the 23-year-old would have been in line to become a restricted free agent following the 2009-10 season. WEEI.com reported last week that the Celtics’ initial offer was five years and $45 million, while Rondo was looking for $60 million over the same time period. For more updates throughout the day, go to the Green Street Blog.