The Dallas Cowboys fear Trevon Diggs tore his ACL in practice, per Tom Pelissero. Diggs will undergo an MRI to confirm whether those fears are based in reality.

Diggs, who has emerged as one of the best defensive backs in all of football over the past two years, will almost certainly miss Sunday's game against the Arizona Cardinals. But that appears to be the least of the Cowboys concern right now.

Without Diggs, expect former Dolphins CB Noah Igbinoghene to step into his role on the outside. Former All-Pro Stephon Gilmore, who Dallas acquired this offseason via trade, will also take on an advanced role.

Trevon Diggs injury news: How long will Cowboys CB be out for?

If the fears of a torn ACL are correct, Trevon Diggs will miss the rest of the regular season and should recover in time for training camp next season.