Gregerson will throw in a minor league game Wednesday, Evan Drellich of the Houston Chronicle reports.

EDGE Analysis

Gregerson threw a bullpen session Monday, but he has yet to appear in Grapefruit League action and will not do so until Thursday at the earliest. Despite the cautious approach that the Astros appear to be taking with the veteran right-hander, manager A.J. Hinch is confident he'll be ready for Opening Day.