One of them will be Dave O'Brien, who has become a rising star at the national level for ESPN, and will continue those duties in conjunction with calling Sox games.
Castiglione's other partner will be Glenn Geffner, who has nine years of broadcasting experience at the Minor League and Major League levels. Geffner has been with the Red Sox since 2003, working mostly in public relations. He was part of the broadcast team of the San Diego Padres in 2002.
However, the broadcasts will not have a three-man booth. Castiglione is on tap to do all 162 games, while O'Brien and Geffner will split the others in a fashion yet to be determined.
"I just want to say how thrilled I am being able to continue in this role," said Castiglione. "It's a job that I have loved for so many years and have tried to continue in the great tradition set by Curt Gowdy, my mentor Ken Coleman, Ned Martin -- who did more Red Sox baseball games than anybody -- and Bob Starr."
The Red Sox opted not to bring back Jerry Trupiano, who was known for his deep voice and "Way Back" call on home runs. Castiglione and Trupiano were a team for the last 14 seasons.
"I had 14 great years with Jerry Trupiano," Castiglione said. "He's a close personal friend and we had a great relationship. I'm sure he'll do very well in whatever lies ahead. He's a consummate professional, knows the game inside and out and has a lot of respect throughout the game."
O'Brien and Geffner seemed to be equally excited up about their move to the Red Sox's radio booth.
For O'Brien, who chronicled Boston's historic exploits in the 2004 postseason for MLB International, this is a homecoming.
"I think that it's a thrill for me, and I really do consider myself a local kid out of Quincy, Mass., and Wollaston Beach and Marshfield and down on the south shore," said O'Brien. "To be able to come home and work with people of this caliber up and down from the Red Sox and Entercom and everybody is just a thrill for me and a dream come true. Like Glenn, and like Joe, I can't wait to get started and go to Spring Training immediately."
For a certified baseball junkie like Geffner, calling Red Sox games figures to be a career highlight.
"As someone who is passionate about baseball, passionate about broadcasting and passionate about the Red Sox, what a time this is for me to get a chance to be a part of this," said Geffner.
The Red Sox and Entercom also unveiled the plan for the 2007 schedule.
This is the first year of a 10-year agreement with WRKO (680-AM), which is a sister station of the club's former flagship, WEEI-850 AM.
Most regular-season games will be on WRKO. However, Wednesday night and weekday afternoon games can be heard on WEEI. The new broadcast teams can first be heard in Spring Training, when 15 games will be on WRKO.