The Red Sox traded infielder Pedro Ciriaco to the San Diego Padres Friday for a player to be named later.
MLB Network's Peter Gammons was first to report the news via Twitter.
Boston designated Ciriaco, 27, who had primarily played third base, shortstop and second base, for assignment on Monday.
Ciriaco had been struggling in Boston this year, hitting just .216 with an OPS of .646.
The Red Sox already had depth in the infield, as they signed Stephen Drew in the offseason, called up Jose Iglesias in May and Will Middlebrooks is now back from a stint on the disabled list, making Ciriaco more expendable.
He hit .293 with 19 extra base hits last season.