Nimmala is day-to-day after suffering a hand laceration with Double-A Rocket City on Thursday, Rhett Bollinger of MLB.com reports.
Johnson took a no-decision against the Orioles on Thursday, allowing one run on three hits and five walks in 4.2 innings. He struck out one.
Natera secured the save against the Orioles on Thursday, allowing no runs on one hit and no walks in 1.1 innings. He struck out two.
Neto went 2-for-5 with a three-run home run in Thursday's 4-1 win over the Orioles.
The Angels will recall Klassen from Triple-A Salt Lake to start Friday's game against the Marlins, Rhett Bollinger of MLB.com reports.
The Royals claimed Little off waivers from the Cubs on Thursday and optioned him to Triple-A Omaha.
The Royals transferred Avila (elbow) to the 60-day injured list Thursday.
Joyce pitched a scoreless and hitless inning in relief against Baltimore on Wednesday, walking one batter and striking out one.
Ballesteros will start at catcher and bat sixth in Thursday's game versus the Orioles.
Guzman is not in the lineup for Thursday's contest in Baltimore.
