Armstead (knee) has been ruled out for Sunday's game against the Buccaneers, Rod Walker of The New Orleans Times-Picayune reports.
Armstead was cleared to return to the lineup for last week's win over the Jets, but he appears to have suffered a setback coming out of that contest that will keep him inactive for Week 15. The Saints will have to make do without both of their starting tackles, as Ryan Ramczyk (knee) is also out for Sunday's contest.