Detroit transferred Vest (elbow) from the 15-day injured list to the 60-day IL on Sunday.
Vest was initially placed on the IL on July 1 due to posterior right elbow inflammation, but follow-up tests later revealed a stress fracture. The injury will result in an extended absence for Vest, who won't be eligible for activation until Aug. 27. Through 27 appearances on the season, the 31-year-old reliever has turned in a 6.08 ERA, 1.43 WHIP and 27:10 K:BB in 26.2 innings.