McGuire was called up from Triple-A Salt Lake on Wednesday, Maria I. Guardado of MLB.com reports.
McGuire will rejoin the big-league team after shuttling back and forth between Los Angeles and the minors throughout the past month. Across 16 appearances in the majors this year, he's logged a rough 6.47 ERA and 1.62 WHIP with a 27:20 K:BB in 32 innings. He will likely be deployed in low-leverage spots.