Flaherty (oblique) will throw about 75 pitches in a rehab outing Friday and will be activated for his next start, barring any setbacks, Jeff Jones of the Belleville News-Democrat reports.
After missing two months with a left oblique strain, Flaherty appears right on the verge of rejoining the Cardinals' rotation. The righty threw five innings combined in his first two rehab starts, allowing two earned runs and striking out eight batters.