Rosenberg was reassigned to minor-league camp by the Angels on Tuesday.
Rosenberg cracked the majors for the first time in his career last season, allowing five earned runs over 10.2 innings while striking out eight batters. He performed well in Triple-A last season (3.16 ERA, 1.24 WHIP) and is having a very good spring, so there is a chance Rosenberg can work his way back into the Angels' bullpen if he maintains his current pace.