O'Brien will be a part of the Braves' 60-man roster, Gabe Burns of The Atlanta Journal-Constitution reports.
O'Brien joined the braves as a non-roster invitee in January and went 6-for-32 with four home runs and seven RBI during spring training, although he also struck out 13 times. The 29-year-old has had limited results in the majors during short stints over four seasons, hitting .209/.275/.434 with 11 home runs and 73 strikeouts over 200 plate appearances. Given his inability to carve out a major-league role in the past, it's unlikely that he'll be a big part of the Braves' major-league plans in 2020, although he could be a fill-in at designated hitter if injuries strike.