Atlanta claimed Vanasco off waivers from the Tigers on Wednesday and optioned him to Triple-A Gwinnett.
Vanasco was designated for assignment by the Tigers earlier this week, but he will now join Atlanta's 40-man roster. The right-handed reliever has allowed 12 runs (11 earned) with a 4:6 K:BB over 6.1 innings in the majors this season, but he's been much more effective at Triple-A Toledo with a 2.53 ERA and 59:24 K:BB in 46.1 frames.