What happened: The Dallas Cowboys have downgraded defensive backs Cobie Durant, P.J. Locke and Malik Hooker, along with linebacker Demarvion Overshown, to out for Sunday's matchup with the Baltimore Ravens. All four defenders missed a second consecutive practice on Thursday and will not travel to Rio de Janeiro.

Why it matters: The absences leave the Dallas secondary shorthanded as they prepare for the international matchup. However, Baltimore is working through its own availability issues, with receiver Zay Flowers and offensive lineman Ronnie Stanley missing Thursday's session.

What to watch: Baltimore defenders Teddye Buchanan and Nnamdi Madubuike practiced fully Thursday, with Madubuike potentially making his season debut Sunday.