ENGLEWOOD, Colo. – The Denver Broncos are in the process of adding free agent Blake Bortles to serve as their backup quarterback, a person with knowledge of the situation told The Associated Press on Tuesday.The person, speaking on condition of anonymity because the Broncos haven’t announced the signing, said the seventh-year veteran is going through the COVID-19 protocols after agreeing to a one-year deal.Bortles, the third overall pick in the 2014 NFL draft, won’t be able to join the team until the weekend.Brett Rypien is expected to serve as Jeff Driskel’s backup Sunday when the Broncos (0-2) host Tom Brady and the Tampa Bay Buccaneers (1-1).Driskel took over last weekend when starter Drew Lock injured his throwing shoulder on a sack in.