The Diamondbacks reinstated Jameson from the 15-day injured list Sunday.
The right-hander has been sidelined just over a month due to hip inflammation, but he's ready to rejoin Arizona's bullpen after two minor-league rehab appearances. Jameson has made 11 appearances for the Diamondbacks this year and has a 4.67 ERA, 1.44 WHIP and 13:9 K:BB across 17.1 innings.