The Rays have made 123 roster moves since Opening Day.
"I just think [the move was made] more for a need," Rays manager Kevin Cash said of Dominguez. "He's a guy that maybe hasn't shown the consistency we're looking for.
"... Hopefully he clears [waivers] and we're able to keep him in our system. Because it is a big arm that we would value. If he could ever get some consistency, that would be beneficial to have."
Dominguez went 1-0 with a 0.00 ERA in four games for the Rays this season. He went 0-2 with a 6.26 ERA in 25 appearances at Durham.
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.