Rosario was optioned to Triple-A El Paso on Thursday.
Rosario was called up in late August and appeared in seven games off the bench during his few weeks in the majors. He went 1-for-5 with a walk and will now head back to El Paso, where he has a .291/.372/.518 slash line with 21 home runs , 76 RBI and 20 steals this season.