Triple-A Salt Lake placed Silseth (elbow) on its 7-day injured list Wednesday.
After being reinstated from the Angels' 60-day injured list and optioned to Triple-A on June 25 following a prolonged absence due to right elbow inflammation, Silseth turned in a 3.38 ERA, 1.31 WHIP and 7:7 K:BB over 16 innings across four outings with Salt Lake before succumbing to another setback with the elbow. The Angels had labeled Silseth's injury as discomfort coming out of his most recent start for Salt Lake on July 28, but a formal diagnosis for his injury hasn't been provided. In any case, Silseth doesn't look like he'll be back pitching for Salt Lake anytime soon, which will hurt his chances of building a case for a return to the big leagues.