Robertson has been added to Tampa Bay's taxi squad and is expected to be called up from Triple-A Durham when rosters expand to 28 players Wednesday, Marc Topkin of the Tampa Bay Times reports.
Robertson inked a minor-league contract with the Rays on Aug. 16. Tommy John surgery has limited the veteran right-hander to just seven major-league innings since the beginning of 2019, but his excellent track record still makes him an intriguing addition to an already-strong bullpen. Robertson figures to see the bulk of his work in lower-leverage innings initially, but it wouldn't be surprising to see him earn some work in key spots if he's able to pitch well during his first few outings.