TEMPE, Ariz. -- About an hour before Arizona Cardinals coach Bruce Arians met with the media Monday afternoon, he found out safety Tony Jefferson will go through the concussion protocol this week, giving Arizona two defensive backs with head injuries.

Arians said he didn’t know Jefferson was symptomatic until this morning when Jefferson reported to the Cardinals' practice facility. Jefferson’s symptoms didn’t start to show until Sunday night and Monday morning, Arians said.

Patrick Peterson suffered a concussion in the second quarter of Sunday’s 24-20 win over the Philadelphia Eagles.

“Both those guys seem to be OK,” Arians said.