The Denver Broncos' brass (and the quarterback himself) have repeatedly said this offseason that Bo Nix (ankle) was on track to participate in organized team activities (OTAs), which are scheduled to begin in early June.

Then, NFL Network's Ian Rapoport reported Tuesday that Nix underwent an "anticipated" follow-up procedure last week. Rapoport indicated that Nix is now on track for training camp, but the QB's status for OTAs is in doubt.

With Nix potentially unavailable this spring, the Broncos might consider adding a fourth quarterback to serve as a "camp arm" of sorts this spring. Such a signing would serve as a temporary QB3 behind Jarrett Stidham and Sam Ehlinger.

No, they're not going to sign Aaron Rodgers. Other high-profile backups like Tyrod Taylor and Jimmy Garoppolo probably aren't interested in competing with Jarrett Stidham (and the Broncos probably already would have added one of those QBs if they preferred them over Stidham). They're also not bringing back Russell Wilson (who has drawn interest from the New York Jets).

The most logical choice might be Ben DiNucci, who has had two stints in coach Sean Payton's offense, and he's the QB the team called when Nix went down with an ankle injury during the NFL playoffs in January. With Nix now potentially unavailable again, it would make sense to bring back DiNucci for the spring.

The list of other veteran QBs available also includes Taylor Heinicke, Josh Dobbs, Brett Rypien, Cooper Rush, Jeff Driskel, Skylar Thompson, John Wolford, Easton Stick and Ian Book. They're listed below, ranked by career starts.

Denver will hold a rookie minicamp next week, and they will likely bring in a veteran QB on a tryout basis. Whoever gets the nod for rookie minicamp might also be a candidate to return for OTAs in June.

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This article originally appeared on Broncos Wire: NFL: 10 free agent QBs for Broncos after Bo Nix's ankle surgery