The Rangers placed Dunning on outright waivers Sunday, allowing him to be claimed by other teams, Joel Sherman of the New York Post reports.
The right-hander remains on the 40-man roster for now, but he could be outrighted to the minors if he goes unclaimed on waivers. Dunning posted a 5.31 ERA, 1.44 WHIP and 91:40 K:BB across 95 innings last season, and he struggled during spring training with 10 runs allow over 11 frames.