St. Louis has been playing with a four-man bench the last week, so Kozma gives the team another bench infielder behind Daniel Descalso.
Fornataro has been pitching well this month, posting a 0.87 ERA and three saves in eight games. He'll provide the Cardinals with a fresh bullpen arm in what could be a high-scoring series at Coors Field against the Rockies.
Either Kozma or Fornataro is likely to be sent down Wednesday with the Cardinals announcing Double-A left-hander Marco Gonzales will make his Major League debut that day with a start in place of Garcia. The Cardinals will have to clear a spot on their 40-man roster for Gonzales as well.