Sam Darnold to start Week 18

49ers QB Sam Darnold will start Sunday's regular-season finale vs. the Rams, HC Kyle Shanahan announced Wednesday. QB Brock Purdy will join RB Christian McCaffrey on the sidelines for that one after San Francisco locked up the NFC's No. 1 seed. WR Deebo Samuel, WR Brandon Aiyuk, and TE George Kittle are unlikely to play much, if at all, against the Rams.