The New Orleans Saints placed three players on the physically unable to perform list prior to the start of training camp on Friday.
Butler may miss the entire season for New Orleans after tearing his ACL during offseason work in June. Butler was expected to come into camp and provide a pass rushing threat for the Saints. Instead, he’ll be lucky to play a single down in 2013.
Robinson also suffered a knee injury during practice in June while Harper is nursing an undisclosed injury.