The Dallas Cowboys were dealt a significant blow to the quarterback position in Tuesday's practice. Tony Romo wasn't involved, but their backup, Kellen Moore, suffered a broken ankle.

The original prognosis, if Moore opted for the surgery-free route, was that he'd be out for six to eight weeks. That would be manageable for the Cowboys, but on Wednesday, the news got worse.

According to Ian Rapoport, Moore is opting to have surgery on his broken ankle Wednesday and will be out three to four months.

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#Cowboys backup QB Kellen Moore will have surgery on his broken ankle today in Dallas, source said. Recovery time is 3 or 4 months.

— Ian Rapoport (@RapSheet) August 3, 2016

This leaves the Cowboys in a precarious situation. Do they roll with rookie Dak Prescott and Jameill Showers, neither of whom have attempted an NFL pass, as Romo's backup? Or do they go out and get a guy like Nick Foles or Mike Glennon?

That remains to be seen, but being without Moore for most of the season hurts greatly -- especially knowing Romo's injury history. Perhaps Prescott, a fourth-round pick, will develop quickly and prove himself worthy of the backup job in the preseason and in practice. That's not something the Cowboys can bank on, but it's possible.