NESN replaces longtime Red Sox play-by-play voice Don Orsillo with Dave O'Brien

The changes around the Boston Red Sox have stretched into the broadcast booth.

New England Sports Network announced Tuesday that Dave O'Brien will become the network's play-by-play voice beginning next season, replacing Don Orsillo.

Orsillo has become a fan favorite since becoming the play-by-play man for the Red Sox in 2001. His contract is set to expire at the conclusion of this season, though NESN did not provide explanation for pursuing a replacement.

"Don is an outstanding broadcaster, and we are grateful for all of his contributions to NESN's telecast over the years," NESN president and CEO Sean McGrail said in a statement. "On behalf of everyone at NESN and the Boston Red Sox organization, we would like to extend our sincere appreciation to Don."

O'Brien has spent the last nine years as the Red Sox play-by-play voice for WEEI and has also done work with ESPN Radio.

"This is absolutely a dream come true," O’Brien said. "It will be a privilege to call Boston Red Sox games on NESN for one of the most storied franchises in Major League Baseball. And I look forward with great anticipation to working alongside Jerry Remy."