Lattimore will need surgery to repair the injury, a source tells PFT. He is considered week to week.
The three-time Pro Bowler missed one series in the second half before returning with a cast on his right wrist, Patrick Magee of The Times-Picayune reports.
Lattimore had three tackles and a pass defensed in the Saints’ victory over the Packers.
Veteran Desmond Trufant, who was a late free agent pickup, replaced Lattimore while he was out.