"It doesn't look good from all indications," Roberts said after the game. "So things can happen, but I just don't see how it's not the end of his season. So it's potentially a huge loss for us."
Hudson, 35, exited the game after his leg buckled while coming off the mound in an attempt to field a ball Ronald Acuña Jr. hit in front of home plate. The pitcher walked off the field with assistance, and Roberts said he would get scans Saturday.
Hudson has appeared in 25 games this season, logging a 2.22 ERA and five saves.
"Huddy's a guy that we count on in a lot of different ways. On the field, one of the leaders in the clubhouse, always doing the right thing, saying the right thing and obviously with Blake (Treinen) down we've relied heavily on him in leverage spots," Roberts said. "To not have him with us, there's an exponential effect to our ballclub. But we got to move forward."