"I don't remember doing it at all," Bourn said after Houston's 12-4 loss. "I've felt it before, but it wasn't major. It might just be from the cold weather, not being acclimated to it."
Bourn, who went 1-for-3 with a double and a run scored prior to exiting the game, said he felt discomfort chasing down a double by Joey Votto in the sixth inning.
Bourn received treatment after the game and said he would be evaluated again on Thursday morning to determine his status for the finale of the three-game series.
"I'll see how it feels in the morning and if I can go tomorrow," Bourn said.