Kohn has posted a 4.01 ERA in 38 appearances for the Angels the last two years, but put up a 7.30 mark in 12 1/3 innings last year. The 25-year-old had hurled five scoreless one-inning appearances this spring, but hasn't checked into a game since March 17 and won't restart his throwing program for at least another week.
Cassevah threw a 25-pitch bullpen session on Wednesday and said he "felt normal." The 26-year-old would be eligible to be reinstated off the disabled list for the first time on April 11 and believes he should be ready to contribute by then.
"I'd rather make sure I'm ready than try to rush back and have a setback," said Cassevah, the sinkerballer who posted a 2.72 ERA in 30 games last year. "I'll be ready soon after [the season starts]."
The Angels have three spots open in their bullpen, with Jason Isringhausen, Kevin Jepsen, Trevor Bell, Francisco Rodriguez and Rich Thompson (out of options) vying for them.