Buttrey was designated for assignment by the Angels on Wednesday.
Buttrey was reinstated from the restricted list in early April and has been with Triple-A Salt Lake all season, but the Angels have now removed him from the 40-man roster. The right-hander has a 5.11 ERA, 1.24 WHIP and 5:3 K:BB over 12.1 innings this season and could remain at Salt Lake if he passes through waivers unclaimed.