Rosscup's contract was selected by the Rockies on Friday.
Rosscup returned to the Rockies in August of 2020, and he'll join the major-league bullpen as a replacement after several pitchers were placed on the COVID-19 injured list Friday. The southpaw has made 17 relief appearances at Triple-A Albuquerque this year and has posted a 0.52 ERA and 0.82 WHIP in 17.1 innings.