Littell signed a minor-league contract with the Rangers on Thursday, Kiley McDaniel of ESPN.com reports.
Littell will be in big-league camp as a non-roster invitee. The 27-year-old was highly effective out of the Giants' bullpen in 2021 before stumbling to a 5.08 ERA in 2022. He should have a decent chance to win a middle-relief role in Texas.