Rosenthal (elbow) is throwing 95 mph in bullpen sessions and hopes to return to the majors at some point after the All-Star break, Martin Kilcoyne of FOX 2 in St. Louis reports.
Rosenthal (elbow) was released by the Tigers on Sunday, Chris McCosky of The Detroit News reports.
The Tigers announced Wednesday that Rosenthal is scheduled to undergo a UCL reconstruction revision surgery for his right elbow next week, Jason Beck of MLB.com reports.
Rosenthal (elbow) was sent to Low-A Lakeland on Thursday to begin a rehab assignment.
Rosenthal is currently sidelined at Triple-A Toledo by a right elbow sprain, Evan Petzold of the Detroit Free Press reports.
Detroit reassigned Rosenthal to minor-league camp Monday.
Rosenthal is scheduled to pitch in Sunday's Grapefruit League game against the Rays, Chris McCosky of The Detroit News reports.
Rosenthal is expected to get into a Grapefruit League game before the end of camp, Chris McCosky of The Detroit News reports.
Rosenthal (lat) will throw live batting practice Tuesday, Chris McCosky of The Detroit News reports.
Tigers manager A.J. Hinch conceded Tuesday that it's "not feasible" for Rosenthal (lat) to be ready for Opening Day after the reliever finalized a minor-league contract with Detroit over the weekend, Chris McCosky of The Detroit News reports.