Diaz was removed from Thursday's game against the Padres after getting hit by a comebacker, Tim Britton of The Athletic reports.
Diaz was able to walk off the field under his own power after taking a 100 mph liner off his left foot. According to Matt Ehalt of Yahoo Sports, the reliever is scheduled to undergo X-rays following the conclusion of Thursday's series finale, after which more should be known regarding the specifics and severity of his injury.