Righthanded reliever Brayan Villarreal cleared waivers Monday and was outrighted to Triple A Pawtucket by the Red Sox. He was invited to major league spring training.
Villarreal was designated for assignment Jan. 22 when the Red Sox signed Grady Sizemore.
Villarreal was obtained from Detroit in July, a spare part in the three-team deal that landed Jake Peavy. In his only appearance with the Red Sox, on Aug. 20 in San Francisco, Villarreal entered the game with the bases loaded and two outs in the ninth inning and walked in the winning run on four pitches.
In 35 minor league appearances last season (most with Triple A Toledo), Villarreal had a 2.76 earned run average. He struck out 50 in 42.1 innings but also walked 30.