The move with Arihara before the series finale against the Chicago White Sox cleared a spot on the 40-man roster for the Rangers to reinstate right-hander Mike Foltynewicz from the COVID-related injury list.
Arihara is 2-4 with a 6.64 ERA in 10 starts this season. He has made three starts since returning from the injured list Sept. 1 after having surgery in May for an aneurysm in his throwing shoulder, including giving up six runs in four-plus innings Wednesday against the Houston Astros.
Texas could assign Arihara outright to the minors if he clears waivers. He could then be invited to spring training as a non-roster player with the chance to compete for a spot in the starting rotation.
The 29-year-old Arihara pitched six years with the Hokkaido Nippon Ham Fighters of Japan's Pacific League before signing a $6.2 million contract with the Rangers in December. He got $3.6 million this season and is due $2.6 million in 2022.
The Rangers also had to pay a $1.2 million posting fee for Arihara.