Bradley, who was called up on June 22, batted .178 with one home run and struck out 20 times in 45 at-bats in 15 games. He was leading the International League with 24 home runs when he joined Cleveland.
The left-handed hitter was selected in the third round of the 2014 draft and has put up big power numbers at every level of the minor leagues.
Plesac is 3-3 with a 4.00 ERA in eight starts with Cleveland. He was sent down before the All-Star break and made one start with Columbus. The right-hander began the season with Double-A Akron and was called up in May.