Cubs outfielder Marlon Byrd confirmed that he has been traded to the Red Sox, tweets Bruce Levine of ESPNChicago.com. The Cubs will receive Michael Bowden and a player to be named later in exchange for Byrd while paying all but roughly $400K of his $6.5MM salary (the prorated minimum), according to Sean McAdam of CSNNE.com (via Twitter).

The Red Sox designated infielder Nate Spears for assignment to make room for Byrd on the 40-man roster, the club announced. Spears, 26, appeared in four games with Boston this season, including today's loss to the Yankees.

Meanwhile, the player to be named will not be left-hander Andrew Miller, according to Alex Speier of WEEI.com.

Byrd, 34, has just three singles and one walk in 47 plate appearances this season, resulting in a .070/.149/.070 batting line. He hit .276/.324/.395 in 482 plate appearances last season while missing time with multiple fractures after taking a pitch to the face, an injury that occurred in Fenway Park. Byrd is in the final season of his three-year, $15MM contract and will earn $6.5MM this year. He is not in Chicago's lineup this afternoon.

Ellsbury's subluxed his right shoulder last week and there is still not timetable for his return. Carl Crawford is also on the shelf with wrist and elbow problems, leaving the Red Sox with an outfield of Jason Repko, Ryan Sweeney, Cody Ross, and Darnell McDonald. Byrd has played center field exclusively during his time with the Cubs, though he has experience in all three outfield spots.

Boston has been actively exploring the outfield market following Jacoby Ellsbury's shoulder injury. The deal will be announced after today's Red Sox game, according to Levine's tweet.

Mike Axisa contributed to this post.