The Athletics traded Boyle, Jacob Watters and Will Simpson to the Rays on Saturday in exchange for Jeffrey Springs, Jeff Passan of ESPN.com reports.
The A's recalled Boyle from Triple-A Las Vegas on Sunday.
The Athletics optioned Boyle to Triple-A Las Vegas on Wednesday.
Boyle is scheduled to start Monday's game against the Rays at Oakland Coliseum.
Boyle came away with a no-decision in Tuesday's 9-4 win over the Mets, giving up four runs on seven hits and three walks over four-plus innings. He struck out six.
The Athletics recalled Boyle from Triple-A Las Vegas to start Tuesday's game against the Mets.
Boyle has posted a 9.00 ERA and issued nine walks over the five innings covering his two starts with Triple-A Las Vegas since being optioned June 5 following his IL stint due to a lower-back issue.
The Athletics reinstated Boyle from the injured list Wednesday and optioned him to Triple-A Las Vegas.
Boyle (back) started Triple-A Las Vegas' win over El Paso on Tuesday, firing three scoreless innings during which he allowed a hit and issued two walks while recording three strikeouts.
Boyle (back) will make another rehab start at Triple-A Las Vegas on Tuesday, Martin Gallegos of MLB.com reports.