The 49ers signed Ansah to a one-year contract on Wednesday.
Ansah joins a San Francisco defensive line that just lost two high-end starters for the season, with Nick Bosa (knee) and Solomon Thomas (knee) both having been placed on IR. The 31-year-old will likely begin his career with the 49ers as a rotational defensive end, but it wouldn't be out of the question for him to earn something more resembling a starting workload as the season progresses.