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Ervin struggled out of the chute,” Dipoto said. “I think his struggles were more relative to his command than his physical stuff. Once he determined that his issue was command, he throttled back his fastball a little bit and tried to gain command of his slider and pitched very well for us. To say Ervin’s season was a failure would be unfair. Ervin’s season was very uneven, and he took it down the stretch and gave us an opportunity to be in the race until the final week of the season.”

The Angels are more interested in developing Richards and attempting to re-sign Greinke, who went 6-2 with a 3.53 ERA during his impressive but brief stint with Los Angeles.

The Angels haven’t announced whether they’ll pick up Haren’s $15.5 million option for next season before Friday’s deadline, and Dipoto gave no hints Wednesday. The club is thought to be shopping Haren, who had a career-worst 4.33 ERA and spent time on the disabled list for the first time.

Sisk spent last season with Triple-A Omaha, going 3-2 with a 2.54 ERA and eight saves. He’s pitching in the Venezuelan winter league and has never pitched in the majors, but Dipoto is eager to see what the 27-year-old can do in spring training.

Los Angeles could use any bullpen help after a mostly dismal season.

“He’s always had the deceptive ability to miss bats,” Dipoto said. “He’s done it at every minor-league level, and hasn’t had the opportunity to showcase it in the big leagues. We don’t know if that’s going to happen. Worst-case scenario is we’re building much-needed depth and building toward creating a little bigger fishnet (in the minors).”