Reyes was removed from Tuesday's game with Triple-A Memphis after three innings.
A reason for his early exit was not immediately provided, but the Cardinals will need a starter this weekend following Monday's rainout, so perhaps this was in anticipation of a callup. The hard-throwing right-hander gave up two runs on two hits and a walk in his three innings of work, striking out seven on 57 pitches. He's struggled over the past month or so, but Reyes is already on the 40-man roster.