Stroman was removed from Sunday's game against the Cardinals with a blister on his right index finger, Meghan Montemurro of the Chicago Tribune reports.
The right-hander surrendered six runs (three earned) on nine hits over 3.1 frames before being pulled from Sunday's start in London. Stroman exited before the blister ruptured, which could give him a chance to avoid a trip to the injured list and make his next start.