Rusin was designated for assignment by the Rockies on Friday, Thomas Harding of MLB.com reports.
Rusin was activated off the injured list last week but won't stick on the 40-man roster after allowing four runs in his two appearances. The 32-year-old also struggled last season with a 6.09 ERA, 1.50 WHIP and 47:26 K:BB over 54.2 innings. Rusin could end up at Triple-A Albuquerque if he goes unclaimed on waivers.