The Mariners have announced a series of roster moves involving their pitching staff. Righty Steve Johnson was designated for assignment and southpaw Wade Miley was placed on the 15-day DL with a shoulder impingement. Seattle has called up right-hander Jonathan Aro and lefty David Rollins to take their places.

Johnson, 28, pitched to a 4.32 ERA over 16 2/3 frames on the year for the M’s. He was striking out better than a batter per inning, but his 11 walks certainly rate as a concern. Those numbers largely match his career line of a 4.26 ERA and 10.2 K/9 against 5.6 BB/9.

The 29-year-old Miley has struggled to keep runs off the board in Seattle and owns a 5.28 earned run average over his 76 2/3 frames on the year. Other than allowing more home runs and drawing a few less grounders than usual, though, he’s looked much like his typical self. Miley has checked in with 6.8 K/9 against 2.8 BB/9 on the year, right around his career averages.

To take a look at the new Mariners pitching alignment, check out the updated Seattle depth chart at RosterResource.com.