Lavarnway played in 10 games with the Boston Red Sox in 2014, going hitless in 10 at-bats. He also hit .283 in 62 games with Triple-A Pawtucket.
Lavarnway was claimed off waivers by the Cubs last week from Boston. In 97 career games, he has a .201 batting average with five home runs.
To clear room for Lavarnway on the 40-man roster, the Orioles released outfielder Quintin Berry.