The Twins activated Ober (elbow) from the 15-day injured list Thursday.
Ober has been sidelined since May 30 with a right flexor strain, but he'll take the mound Thursday against Cleveland after making a pair of rehab starts. The right-hander is 6-3 with a 4.59 ERA, 1.22 WHIP and 46:18 K:BB across 66.2 innings this season.