Kohn, who began the season on the 15-day disabled list, hurled five scoreless innings in Spring Training but was shut down once the nerve in his right forearm -- a sensitive area for a pitcher -- began to flare up. The 25-year-old felt good the first time he got back to throwing, but a little over a week ago, when he tried to stretch it out to more distance, the pain ensued and he hasn't picked up a baseball since.
Kohn posted a 2.11 ERA in 24 games for the Angels as a rookie in 2010, but he struggled through a 7.30 ERA in 14 appearances last season and wasn't called back up from Triple-A when rosters expanded in September.
Reliever Bobby Cassevah (shoulder inflammation) hurled a scoreless inning for Class A Inland Empire on Friday and is eligible to come off the DL on Wednesday, but manager Mike Scioscia said he'll "probably need a little bit more time."
Jerome Williams (strained left hamstring) will be in the six-inning, 90-pitch range for Inland Empire on Tuesday, in what is expected to be his final rehab start. Williams is in competition with Garrett Richards for the fifth spot in the rotation, which the Angels won't need until Sunday's game at Yankee Stadium.