Marvin Mims Jr. is healthy and ready for game action. Following a solid week of practice, Broncos head coach Sean Payton said Thursday the rookie wide receiver will make his preseason debut against the San Francisco 49ers on Saturday. Mims, a second-round pick from Oklahoma, was sidelined in last week’s loss to the Arizona Cardinals, as the team has been monitoring him closely while he’s dealt with hamstring injuries since OTAs and minicamp.